How do lawyers find expert witnesses? When a lawyer needs an expert witness I assume he looks for three things: Unimpeachable credentials Motivation to support his case The ability to favorably impress a jury, via a compelling demeanor and convincing, lucid, and engaging testimony. For commonly litigated fields like medicine I assume there are directories and services for experts? But what about less common fields? Maybe statistics, ballistics, chemistry, applied physics? Or, looking at this question another way: Suppose I am an expert in a field and I have been told that I have a gift for engaging a lay audience in it. How might I alert interested lawyers to my willingness to serve as an expert witness? Is there a competitive market for expert witnessing?
tl;dr: Yes, there is a competitive market for experts. Background As an example, firms like Compass Lexicon, Analysis Group, Cornerstone, and Charles River all do economic and forensic consulting, which is helpful for antitrust, securities, and corporate cases writ large. In the U.S. they're frequently brought in by a client's legal team, so the analysis is generally protected by the work-product doctrine in Fed. Rules of Civ. Pro. 26(b)(3). This speaks to #2 above. Regarding #3 and #1, the firms bring in prominent faculty members or researchers to enhance the credibility of testimony. If you're an expert in _______, a good starting point might be to get in touch with a few forensic _______ consulting firms. By nature, they'd have their ear to the rail concerning upcoming litigation.
When a complaint is first file, per case law, courts have a duty to believe each allegation you make on information and belief as long as they are each not contradicting any other statement or other evidence present at the time of filing. This isn't true. The court doesn't have to actually believe you. The court merely has to assume for sake of argument that the things said are true for the narrow purpose of evaluating whether they describe a legal wrong in a formal sense. Also, under modern federal pleading rules in the U.S., the judge doesn't have to believe you and can dismiss your complaint if it is not &quot;plausible.&quot; Your attorney has a duty to not merely assume that everything that a client tells the lawyer is true. In federal court, the governing rule is Federal Rule of Civil Procedure 11, which states that when an attorney files and signs a document in court that the attorney: certifies that to the best of the person's knowledge, information, and belief, formed after an inquiry reasonable under the circumstances: (1) it is not being presented for any improper purpose, such as to harass, cause unnecessary delay, or needlessly increase the cost of litigation; (2) the claims, defenses, and other legal contentions are warranted by existing law or by a nonfrivolous argument for extending, modifying, or reversing existing law or for establishing new law; (3) the factual contentions have evidentiary support or, if specifically so identified, will likely have evidentiary support after a reasonable opportunity for further investigation or discovery; and (4) the denials of factual contentions are warranted on the evidence or, if specifically so identified, are reasonably based on belief or a lack of information. The California state law obligations is more or less identical in substance, although the procedural rules of California are codified differently than the federal rules. So, a lawyer is required to reasonably inquire into whether the client is telling the lawyer the truth about the client's motives and about the facts. It is a breach of the lawyer's duties to the court and the profession to simply take what a client tells the lawyer at face value, accepting it uncritically.
Short Answer The concern raised is a real one, but it is much less serious than one might naively expect. Long Answer Precedents Apply Only To Resolve The Legal Arguments Presented On The Facts Found To Exist At Trial A Bad Lawyer's Failure To Develop Facts At Trial Isn't A Serious Problem A precedent determines the law as applied to a particular set of facts found by the trial court and confirmed as properly in the trial court record by the appellate court, as to a particular legal issue. Failure to prove facts at trial due to the fault of counsel for a party in the trial court changes the scope of the precedent. Failure to establish facts in one case that sets a precedent, doesn't prevent a similarly situated party, in a case with essentially the same actual facts, from doing a better job and thus presenting a set of facts that are not governed by the same precedent. The precedent from the ill argued case would not apply because the facts as found by the trial court would be different. A Bad Lawyer's Failure To Present Legal Arguments Isn't A Serious Problem if a someone lost a case merely because they did not come up with an argument which, should they have come up with, would convince the judge to rule in their favour, and that case has become a precedent, the fate of any following cases in lower courts with comparable facts will be decided by that unluckily slow-thinking litigant/lawyer. Likewise, suppose that due to incompetence of counsel, a key legal argument isn't made. When a trial court lawyer makes that mistake, the precedent will merely resolve the legal arguments that were resolved by the trial court. This won't preclude a future litigant from making different legal arguments that are stronger in the same circumstances since the precedent won't resolve those legal arguments. For example, suppose that a trial, a lawyer for one side fails to argue that the statute of frauds (which requires certain contracts to be in writing) bars the claim, and the judgment in favor of other other side on an oral agreement is upheld on appeal. A lawyer in a new case with the same facts can move to dismiss the other side's claim based upon the statute of frauds, because the precedent upholding the oral agreement didn't resolve the question of whether the statute of frauds could be used to dismiss the claim arising under that agreement. There Aren't Better Alternatives To Sift Through Legal Arguments No lawyer can make every argument. The incentives of the system and the professional regulation of lawyers, however, increases the likelihood that the strongest arguments will be made to the court setting the precedent and in the trial court before an appellate court considers the issue, relative to pretty much any other means of clarifying ambiguous issues in the law, where the advocates for different legal rules usually don't have the same strong incentives to argue their cases as well as they possibly can. The Risk Posed By Ineffectual Rhetoric In Favor Of Good Rules Of Law Is Real But Limited This doesn't mean that bad lawyering doesn't give rise to bad precedents. But when this happens it is usually because for a given argument and set of facts, the lawyer for one side is so much more rhetorically effective in making a legal argument than the lawyer for the other side which is proposing a &quot;better rule&quot; of law. But the exclusion of people who can't finish law school and pass the bar exam from the process makes a truly decisive advantage for one party over another in rhetorical effectiveness fairly rare. To the extent that rhetorical failure in appellate briefing is the cause of a bad precedent, the long term systemic effect of this problem (some would call it a feature of the system rather than a flaw) is that the side with more resources that can afford to hire better lawyers will tend to produce legal results that favor similarly situated parties going forward. Thus, it produces a sort of diluted &quot;natural selection&quot; effect (a bias that is equally, if not more concerning, in the duel of lobbyists for all sides of an issue in the legislative process). The other safeguards discussed below, limit this risk, although not completely. Other Safeguards Subject-Matter Jurisdiction The requirement of an actual &quot;case and controversy&quot; for subject-matter jurisdiction, and the requirement of &quot;standing&quot; for subject-matter jurisdiction are designed to prevent someone from intentionally making straw man arguments on appeal that produce precedents that are bad law. Thoughtful Appellate Judges When Opinions Are Published Also, appellate court precedents are made by a panel of multiple (usually three at the first direct appeal level) experienced and esteemed judges who are acutely aware that the decisions that they are making in precedent setting cases influence the law in other cases which causes them to look beyond the arguments of the parties to resolve the dispute. It isn't at all uncommon in such cases for an appellate court to resolve a case on appeal on the basis of arguments not made by either party in their briefs, or precedents or statutes not mentioned by either party. Furthermore, most appellate court decisions are unpublished opinions that expressly determined by the panel making the decision not to make a binding precedent, which allows panels of judges in these cases to take less care to run afoul of the risk of making a bad decision due to bad lawyering by a party. So, in the minority of cases that are published and create binding precedents, judges are especially careful to consider this risk. Five More Safeguards The other main safeguards in the case law system against bad precedents due to poor lawyering by a party are: (1) the ability of uninvolved third-parties to file amicus briefs in connection with an appeal presenting perspectives on legal issues not presented by a party, (2) the ability of a state supreme court or the U.S. Supreme Court (or both) as the case may be, to overrule intermediate appellate court precedents that were wrongly decided, (3) the ability of legislatures to change non-constitutional legal rulings by statute, (4) the procedural requirement that the relevant state or federal attorney general be given notice and an opportunity to intervene in cases challenging the constitutionality of a law, and (5) the ability of the political process to amend the relevant constitution to address a bad binding precedent by a highest court on a constitutional issue that the legislature cannot fix. Collectively These Safeguards Help Somewhat None of these safeguards are fool proof. But, collectively, these safeguards reduce the risk of a bad precedent being established due to bad lawyering in an adversary system, that the inherent limitation of a precedent being limited to particular facts and particular legal arguments provides as a primary means of preventing. Other Causes Of Bad Precedents Are More Of A Problem In general, once all of the considerations above are taken together, the risk of a bad precedent being made due to bad lawyering, while it is real, is significantly smaller than the risk that a bad precedent will be made because the appellate judges rendering the precedent making opinion are bad judges. Bad judges usually end up as judges with appellate precedent making power because they were selected more based upon political considerations, as they are in many states, and in the federal system, rather than primarily based upon the soundness of their legal judgment. When one risk factor that can lead to a bad decision is much larger than another risk factor that can lead to a bad decision, further improvements in the smaller risk factor will rarely make all that much of a difference in the overall likelihood that the system will produce a bad precedent. So, the adversary system, is, on balance, good enough make the risk of bad precedents arising from bad lawyering a not very troubling problem with the system, even though it is a real risk that sometimes does produce bad precedents.
Lawyers neither try nor judge cases; they advise and argue them. Criminal cases in jurisdictions based on British law (which seems to be what you are asking about) are tried by prosecution and defence both putting their best arguments to the court (either a judge or a jury) who then reaches a verdict. There is no reason why the prosecuting lawyer should not be a police officer (assuming he is properly qualified), though in reality 'prosecuting advocate' is a full-time job, so the officer would need to transfer to the District Attorney's office or something similar. Actually, such an officer would be wasted by a transfer to advocacy. Somebody who knows not only what evidence is inadmissible and the leading cases on permitted searches but also where the local crime blackspots are and which officers, likely to fall apart on creoss-examination, should not be put up as the only witness is valuable enough that the authorities (whoever they may be) will make considerable efforts to use these talents to best effect.
Thus being a fundamental question of constitutional law, this translates into asking how SCOTUS would likely rule given a certain situation where e.g. there was no confession and the two-witness requirement is not satisfied. In the case of Cramer v. US, 325 U.S. 1, the direct testimony of two or more witnesses established that "Cramer met Thiel and Kerling on the occasions and at the places charged; that they drank together, and that they engaged long and earnestly in conversation", but "There was no proof by two witnesses of what they said, or in what language they conversed; no showing that Cramer gave them any information whatever of value to their mission, or that he had any to give; no showing of any effort at secrecy, they having met in public places, and no evidence that Cramer furnished them shelter, sustenance, or supplies, or that he gave them encouragement or counsel, or even paid for their drinks". The ruling (in favor of the defendant) focused on the fact that what was suffiently witnessed was not treasonous (drinks and conversation are not overt acts of treason). The court assigns some significance to the testimony of a single witness Kopp, stating that To the extent that his conviction rests upon such evidence, and it does to an unknown but considerable extent, it rests upon the uncorroborated testimony of one witness not without strong emotional interest in the drama of which Cramer's trial was a part. The fact that the evidence was uncorroborated is dispositive in this case. There has not been a case where a conviction was supported only by circumstantial evidence, and the language of the Constitution plus the meaning of "testimony of a witness" is clear enough that it would be a major break with legal tradition to say that circumstantial evidence can substitute for direct evidence (testimony). A video recording cannot testify, only a person can testify. A person can testify that they watched a video, but they cannot testify that they directly witnessed defendant making a certain statement. Rather they can testify that they inferred from watching the video that defendant made a statement. This is not to say that some SCOTUS could not find a path for conviction based on circumstantial evidence, but that would be a significant break from existing tradition.
An adult is normally assumed to be competent to enter into a contract unless there is some reason to think otherwise. It is not usual to demand evidence of competency unless there is something in the appearance or actions of a party that raises such a question, or something about that party, such as a history of mental illness, known to the other party, that raises such a question. I have heard of a party being medically examined just before signing an important document, to provide evidence of competence, but generally in connection with a will, and generally when the signer is elderly and in poor physical condition, and even then such a procedure is rare. If competence is disputed, medical evidence is required to resolve the question, or more exactly to establish lack of competence. In the absence of such evidence, competence will be presumed. That was the conclusion of the MA Supreme Court in FRANCES M. SPARROW vs. DAVID D. DEMONICO &amp; another, 461 Mass. 322* (2011). The court held: without medical evidence or expert testimony that the mental condition interfered with the party's understanding of the transaction, or her ability to act reasonably in relation to it, the evidence will not be sufficient to support a conclusion of incapacity. It was a significant part of the court's reasoning in that case that a reasonable person might well have entered into the agreement in question, and that the party was represented by a lawyer, and acted in accord with the lawyer's advice. That does not, however, seem to be a requirement; merely additional evidence of the reasonableness of the action.
The answers to your questions are, generally speaking, contained in the Model Rules of Professional Conduct. It's important to note these aren't mandatory across the country, although some states have implemented Rules that closely track them while others have their own Rules. Start with Rule 1(e), which defines informed consent as the agreement by a person to a proposed course of conduct after the lawyer has communicated adequate information and explanation about the material risks of and reasonably available alternatives to the proposed course of conduct Next up is Rule 1.2, Scope of Representation &amp; Allocation of Authority Between Client &amp; Lawyer. Subject to two exceptions, a lawyer shall abide by a client's decisions concerning the objectives of representation and, as required by Rule 1.4, shall consult with the client as to the means by which they are to be pursued. The two exceptions are in Rule 1.2(c) and 1.2(d): an attorney can limit the scope of representation with a specific client after obtaining the client's informed consent and an attorney is forbidden from counseling a client to engage or assist him in engaging in conduct the attorney knows to be illegal/fraudulent. Finally, as it was mentioned in 1.2, we turn to Rule 1.4, Communications. (a) A lawyer shall: (1) promptly inform the client of any decision or circumstance with respect to which the client's informed consent, as defined in Rule 1.0(e), is required by these Rules; (2) reasonably consult with the client about the means by which the client's objectives are to be accomplished; (3) keep the client reasonably informed about the status of the matter; (4) promptly comply with reasonable requests for information; and (5) consult with the client about any relevant limitation on the lawyer's conduct when the lawyer knows that the client expects assistance not permitted by the Rules of Professional Conduct or other law. (b) A lawyer shall explain a matter to the extent reasonably necessary to permit the client to make informed decisions regarding the representation. (emphasis added) Your question was Are the above distinctions more or less the correct ones? The answer is yes and no. As to the objective of the representation, the client makes that decision. How to arrive at that outcome is not as cut-and-dry. From the language in the above Rules, there is not one party or the other who has the &quot;final say.&quot; (I say this notwithstanding the fact that, because the client can't go file something on his own, technically the lawyer has final say as he or she is the one who must file a document with the court). Major decisions in the litigation have to be explained to the client and, after that, the client must give consent approving the decision. How does this work in real life? Frankly, it will depend on the client and the lawyer. And don't worry, the phrase &quot;a doctor or lawyer who treats themselves has a fool for a client&quot; is not only apt, it's common sense. When a person is involved in a conflict, their point of view is skewed in their favor and to represent themselves is risk their blindspots leading to unnecessary potential pitfalls throughout the case.
You do not have to. The burden of proof is on the prosecution to prove that you made the threat. Reasonable doubt exists in the circumstances that you describe, that there are no logs of who accessed what when and how. Your attorney may have to introduce expert witnesses who can explain how it is possible that text from your computer can end up on a web page, and they can testify that there are many ways that data can be entered into the database, only a few of which actually involve you.