One Identical Twin Proven Guilty An unlikely scenario but one I've always wondered about: Let's say that a murder was committed. There is a pair of identical twins. Both twins had means, motive, and opportunity for the murder. It has been proven beyond reasonable doubt that one of them committed the crime. A witness actually saw one of the twins stab someone, to death but he can't tell which one. The knife has been found, and has the twins' DNA on it. Of course, their DNA is identical, so it is evidence that one of them did it, but tells us nothing about which one. Neither twin has been able to establish an alibi. Am I correct in assuming that a conviction is impossible, because either twin could argue that the other did it? What if one twin established an alibi, would that be sufficient to convict the other?
A conviction isn't ever impossible, but it could well be highly unjust. Indeed, there is a current case where a man alleged that he was the murder, though his identical twin brother was convicted. This article indicates that identical twins are not necessarily genetically indistinguishable. Assuming there is a lack of positive evidence such as fingerprints or an alibi which clearly identifies one versus the other, then one would predict no conviction because there would be a highly reasonable doubt. See the case of Orlando Nemnhard, where one of two twins did it but the DA concluded that they couldn't prove which one, so the charges were dropped.
There actually is a practical effect to a "not proven" v. "not guilty" verdict in Scotland, but it is mostly sociological or social in nature rather than legal. If your question is, are there future legal concerns, than no. Not proven is, to be sure, an acquittal. However, it is an acquittal that the tells the public something important: that the trier(s) of fact thought the person likely guilty. That's a fairly substantial distinction. In Scotland, a criminal case may be decided either "in solemn procedure", which is simply the Scot term for a jury trial v. "in summary" or in "summary procedure" which is the U.S. equivalent of a bench trial. The difference between the two (and the divergence from the U.S. procedural vehicle) is that for lesser crimes the accused doesn't have an automatic right of a jury trial for any criminal matter. In some ways this lesser included makes up for the fact that the Scottish accused is without absolute right to choose jury or bench trial, which in the U.S. can be very meaningful from a tactical perspective. Think of how important the make-up and emotional proclivities of juries are to both convictions and acquittals. A bench trial can be beneficial to the truly unlikable defendant, or in especially brutal crimes, where juries may convict out of fear or sympathy for the victim, even if the case is weak. At the same time, they may nullify the conviction for the sympathetic defendant. Juries are notoriously emotional and bias driven. Being able to choose a bench trial where the judge will follow the evidence and avoid the emotional response of a jury can be invaluable. Just as a sympathetic defendant can appeal to the emotions of the jury for acquittal or jury nullification, on the opposite spectrum. In Scotland, lesser crimes are always (with limited exclusions) tried by a judge, while more serious allegations always (again w/ limited exclusions) get a jury trial, automatically. The defendant does not choose the type of trial he is afforded. Hence, a defense or a prosecution cannot fiddle with the balance of proof based on emotion or lack there of. They get what they get. There are various rules procedurally that differ in comparison, but since this isn't the question that is the general rule and should suffice for background. Also hugely important is the fact that in Scotland, jurors decide a case by majority vote (like a civil trial in the U.S.); hence, there are no hung juries and they don't need a consensus. So, one way or another the verdict will be given in a Scottish criminal action. Scots also get comparatively huge juries to any other country (15 jurors) and they only need 8 in agreement to reach a verdict. Tactically, the "not proven" is a lesser included verdict (like U.S. uses lesser included charges in cases that are weaker for the prosecution). This lesser included finding can be used by choice when the Prosecution has a sympathetic defendant or when the defendant is probably guilty or unlikable. If the jury thinks the defendant (called "accused") probably did the crime, but the prosecution has failed to prove the elements, they can/will issue a "not proven" verdict. This sends a big message. This, again, is typically only reserved for those cases when there is strong but not conclusive proof that someone committed a crime. They don't want to profess their innocence with a not guilty verdict, so they are still acquitted, but with he stigma of the "not proven" verdict attached. Some estimates have from 1/5 to a full 1/3 of all acquittal verdicts by Scottish juries as "not proven" as opposed to "not guilty". Not proven can also be used by judges in the bench trial (summary procedure), however it's much less common. The proportion of 'not proven" acquittals in general is higher in the more severe cases; but so then are the proportion of acquittals versus convictions. These would likely be hung juries in the U.S.. Both in the "solemn" and the "summary" acquittals, not proven is interpreted as indicating that the jury or judge, respectively, is not convinced of the innocence of the accused; in fact, they may be morally or even factually convinced that the accused is guilty, but do not find the proofs sufficient for a conviction under the elements of the crime on the jury instruction/verdict form. I look at this as similar to the adage oft used in the U.S., which is an acquittal, despite the fact that the verdict is termed "not guilty" does by no means indicate the person is in fact "not guilty", it just means the prosecution couldn't prove its case. Sociologists in the U.S., as well as legal scholars, have studied the phenomenon, and it appears that most not guilty verdicts in fact let go a guilty person. This can be intuited by the evidence the jury never saw, either by suppression from bad searches, by the exclusion of witness testimony due to procedural rules like hearsay, privilege, etc., and other forms of keeping relevant evidence from the jury to protect the rights of the accused. But in the U.S. the person can go forth and say, "Hey, I was proven not guilty!" Scotland also has another interesting rule of criminal procedure, whereby a criminal can't be convicted without corroborated evidence. What this means is that if all the prosecution has is the victim witness, by way of proof, testifying, and no physical or corroboration testimony, Scottish law requires acquittal, but often will be so by the verdict "not proven". This is huge, if you think about it. Use, for example, a rape trial. A woman testifies, saying that Joe Schmoe climbed through her window and raped her. She knows Joe - he's her neighbor. Nobody saw him climb in. But she knows it's him. He leaves no physical evidence, having shaved his entire body and used appropriate protection (gloves, condemn, etc.). She has a rape kit done. Rape is obvious, but the only proof is her testimony. Joe goes free. But in Scotland, he goes free with a stigma attached. He's found "not proven" rather than "not guilty". I think this corroboration rule has a lot to do with why this verdict system still exists. In the U.S. the trier of fact would weigh the testimony and decide if one person was substantially more believable than the other, and a verdict would issue. That is a substantial difference, procedurally. Since Scotland doesn't have the hung jury because there is no consensus required they use the "not proven" in the same way a U.S. jury uses the hung jury when one or more jurors thinks the prosecution didn't prove their case but it's fairly clear the defendant is, in fact guilty. Then, you will often get a "hold out" juror, and since the U.S. requires a unanimous verdict, the hold out hangs the jury. It's sort of the opposite of jury nullification. The person knows that the evidence fell short, but their conscience can't reconcile letting the person go free, so they will vote guilty to hang the jury, almost ensuring the prosecution gets another shot. There has been a lot of debate about this three verdict system in comparative law circles, with many legal scholars saying it's antiquated. But I think it serves an important purpose. It carries the stigma of likely guilt for those people who probably committed the crime but got off. Further, the hung jury cost tax payers millions of dollars in the U.S., and this is often the side effect of people not wanting there to be absolutely no recognition of the fact that the accused probably committed (especially serious) crime(s). The Scots, on the other hand, have found away to accomplish this without the cost and emotional toll multiple trials takes on all the players involved, from witnesses and victims, their families, the accused, and even the lawyers and the prosecutions, who have to put in all the work of a trial just to start anew. Here is a really good scholarly article that deals with this interesting phenomenon not seen in (I don't believe) any other country: https://journals.iupui.edu/index.php/iiclr/article/viewFile/17848/18019
As for the subject matter (what can be protected), amplitude, frequency, harmonic pattern, duration etc. are all physical facts, and there is no protection for physical facts. The basic requirement is that the thing protected must be "creative". Once you have a creative composition (assuming it is a composition, where infringement is harder to establish), the question arises whether a particular other composition infringes, or is an independent creation deserving its own protection. Again, the law does not deal in technical acoustic properties, and "similarity" is dealt with in an essentially subjective manner. The find of fact, who is an ordinary observer, has to weight all of the evidence and decide whether there is substantial similarity (or striking similarity) which could be evidence of infringement (substantial similarity is not against the law, copyright infringement is). Both parties to the litigation will present testimony supporting their contention and refuting the others' contention. At some point, one side is likely to introduce expert testimony to the effect that there are only so many possible melodies, which if persuasive can overcome a feeling that two compositions are rather similar. The law only addresses the logic of that judgment, and not the scientific facts. For example, in the case of Testa v. Janssen, the legal premise is set doen that "proof of direct access is unnecessary where striking similarities between two works are present". HOw then do you know if there are striking similarities? To prove that similarities are striking, plaintiffs must demonstrate that "such similarities are of a kind that can only be explained by copying, rather than by coincidence, independent creation, or prior common source." Stratchborneo v. Arc Music Corp., 357 F. Supp. 1393, 1403 (S.D.N.Y.1973) citing a previous ruling on that point. Ultimately, the courts cannot not dictate a scientific procedure for making that determination.
In US law, there was, as far as the question indicates, no probable cause to search her phone at all, Therefore (unless there is some cause not mentioned in the question), any such search is illegal, and any evidence found in such a search, or that is found as an indirect result of such a search (pointers toward it are found in the search, and followed) would not be admissible in any criminal case against Alice. In the case of Bob, if his friends and family approach the police or other authority with a vague suspicion that Bob might be involved in the creation of illegal content That will probably not constitute probable cause for an arrest of Bob or a search warrant for his phone. Unless the accusation does prove to constitute probable cause, any evidence found during such a search would not be admissible against Bob in a criminal case. In practice, most US police would not undertake either search without better evidence than is described in the question. But some police will overstep the lines, which is what the US exclusionary rule is for. Legal procedure does not as far as I know make a distinction between "exploratory" and "confirmatory" evidence. Instead, evidence is either admissible or not. The rules for when evidence is admissible are quite complex, and vary by jurisdiction. Some of them are more traditional than logical, and some of them are addressed to particular problems that have arisen in particular circumstances. But the US Fourth Amendment protections against unreasonable searches, and the requirement of probable cause before search or arrest warrants are issued, serves some of the same purpose. Other countries have different rules, but many of them restrict the authorities to some extent from making arbitrary searches with no initial evidence. Response to the Revised Question As the question has been edited, there seems to be fairly clear probable cause to search Alice's phone, and if clear evidence of "illegal pornographic content" presumably actually child pornography, as no other kind is illegal simply to posses) is found, she can be brought to trial and perhaps convicted. The mere "suspicion" of Alice's "friends and relatives" would add little and mi8ght well not even be admissible. The facts, if any, on which those suspicions are based might be admissible, one cannot tell from the summary in the question. The case against Bob, however, remains weak. Indeed there still seems to be no probable cause either to arrest Bob nor to se3arch his phone, and the results of any search that was done would not be admissible. Probably none would be done without more evidence. The OP wrote: Thus, although the situation looks grim for both, since the evidence against Bob is confirmatory, it might be considered stronger. Not so, the case against Bob is weaker, indeed so weak that an arrest would be unlikely, and if one were made, the case would likely be dismissed before going to trial, assuming no more evidence than was included inn the question. The evidence prior to the search seems to consist only of vague suspicion not supported by any actual evidence, and so there is nothing to confirm, and no valid search would occur. That suspicion of Bob came before the search, and the search is thus "confirmatory" is not relevant. The question is, what evidence against each defendant is admissible, and does the totality of the admissible evidence amount to "proof beyond a reasonable doubt" no matter what order it was discovered in, or what idea was in the minds of the investigators, provided that they were acting lawfully so that their findings are admissible.
I'm not sure what jurisdiction you're referring to, but here are the state involuntary manslaughter laws. Broad brush, the elements tend to be: Someone was killed as a result of act by the defendant. The act either was inherently dangerous to others or done with reckless disregard for human life. The defendant knew or should have known his or her conduct was a threat to the lives of others. However, you're really backwards planning from a jail vs. army decision, so you might actually be after something like felony hit and run, which can most certainly result in incarceration. The elements of felony hit and run generally include leaving the scene of an accident regardless of fault (hit and run typically becomes a felony when someone was injured in the accident). Since the elements vary from jurisdiction to jurisdiction, it makes sense to look them up wherever the accident will take place in the book. If it takes place in the U.S. this is a state-by-state compendium. Then you can tweak the story to satisfy the applicable elements and induce the jail vs. army decision (even if army policy prohibits it, it's still pretty common fiction!).
The life sentences were based on counts 2 and 4, distribution of narcotics by means of the internet and continuing criminal enterprise. In reviewing the sentencing hearing, all of the evidence indicates that the sentence was based on the nature of his acts, and not anything he did after his arrest. There is no way to know if prosecutors would have been amenable to a plea bargain.
An alibi is a particular kind of defense strategy bearing on the burden of proof: here is the alibi jury instruction for California. The defendant contends (he/she) did not commit (this/these) crime[s] and that (he/she) was somewhere else when the crime[s] (was/were) committed. The People must prove that the defendant was present and committed the crime[s] with which (he/she) is charged. The defendant does not need to prove (he/she) was elsewhere at the time of the crime. &quot;I had put the gun down&quot; is not an alibi defense, &quot;I was not in my right mind at the time&quot; is not an alibi defense. The alibi defense is essentially a formality that clarifies the logic of &quot;reasonable doubt&quot; for the jury. If the defendant could not have committed the crime because they weren't there, then that is the end of the discussion. The prosecution will introduce various facts that suggest that the defendant may have committed the crime. The &quot;reasonable doubt&quot; instruction is widely interpreted by jurors to involve a defense obligation to disprove that evidence, which is a reason why a number of jurisdictions have adopted a different instruction based on &quot;being firmly convinced&quot;. Reasons to doubt prosecution evidence can be weak and highly speculative, and the courts have struggled for years to find a good way to convey exactly what &quot;reasonable doubt&quot; is. An alibi goes way beyond merely detracting from the prosecution's case. An alibi is not an affirmative defense where you have to prove the claim by a preponderance of evidence. If you can establish that you were somewhere else when the crime happened, had no opportunity to have committed the crime and could not have committed the crime by another means, you have defended yourself against the charge (assuming that the prosecution does not successfully challenge the credibility of the alibi witness). And in California, you have to give notice that you intend to use the alibi defense.
No If she has probable cause, yes. The question is whether "a reasonable amount of suspicion, supported by circumstances sufficiently strong to justify a prudent and cautious person's belief that certain facts [Bob is a thief] are probably true"? Its likely that the answer to this question is yes. None No Charlotte listens to Alice, Charlotte asks Bob questions which Bob may or may not answer. Charlotte can ask Bob to produce the receipt, Bob doesn't have to. Charlotte can ask to search Bob, Bob doesn't have to consent. If Bob tries to leave, if Charlotte has reasonable suspicion the Bob has committed a crime (which she could certainly justify) she may detain him temporarily without arrest. If Charlotte has probable cause to believe that Bob has committed a crime (which she could probably justify) then she can arrest him.