Stochastic legal liability I am trying to understand how do legal systems handle situation where there is no clear causal responsibility of a person, but a well established stochastic relation. I am aware of the &quot;beyond reasonable doubt&quot; standard in some legal systems but I'd welcome any more information of text to continue research. For an example, let us assume that it's proven that certain chemical compound can induce a specific disease - some type of cancer, for an example. It is also well established that exposure to that chemical is not sole cause of this type of cancer, so there is incidence in a healthy population. So, let say that incidence doubles and it is found that a factory upstream of affected population has been dumping this chemical into water source. Person that has this disease sues the factory. There is no scientific way to prove that the person wouldn't get it without exposure, but it can be proven that this is probable (50%) and that the person was exposed. How would such situation be viewed in continental or common law?
As an academic matter, the US system has struggled with this, and law professors spend their lives debating it. As a realistic matter, I'd bet that company in your example gets nailed. On the theory, the issue here is but-for cause. Civil liability requires that the jury find it more likely than not, or over 50% likely, that but-for D's actions, P's injuries would not have occurred. Your hypo puts it at exactly 50, and tie goes to the defendant, so in this case even the theory is clear. But, say you change it a little bit to make it more like 65 or 70%. Now, you're getting into the territory of the classic blue bus case. A man is hit by a blue bus. Two companies in town own blue busses, and one company owns 90% of them. Can he recover against that company with no other evidence? The black letter answer is no, that naked statistical evidence doesn't cut it. The rationale is that if it were the other way, anytime someone got hit by a blue bus, that company would automatically have to pay out unless they had some evidence to disprove their liability. The burden of proof has been shifted, violating a fundamental tenet of our legal system. But, this doctrine obviously poses an issue for plaintiffs like yours. It's one thing to say that someone hit by a bus needs to have more evidence. Theoretically, they could go out and get it: they could find the bus routes and schedules, examine where they were, and show that X company had a bus going by there at that time. They can also canvas for witnesses. It's much harder when, as your excellent hypo touches on, the science is so complicated. One controversial solution that has been debated a lot recently is market-share liability, but that doesn't seem pertinent here because you have mentioned another company. On the legal realist side. As far as I can tell the system usually finds a way to hold the company responsible. One example is the tobacco litigation. My understanding is the science couldn't definitively prove that smoking caused cancer, but it could prove that it raised the risk significantly. Here's some information on that https://www.tortmuseum.org/the-tobacco-cases/ from the American Museum of Tort Law, which, yes, is a real thing.
In the US, it depends on the jurisdiction because each state has its own homicide statutes: but, the defining elements don't differ a lot. Drawing on Washington state law, the first question is whether you intended to kill a person (it doesn't have to be a specific person). If you did, you have committed first-degree murder. It is first-degree murder, because it requires a certain amount of advance planning to kill with a drone. It does not matter that the drone houses the gun that killed the person and a program determines when the gun fires (the "it was the drone, not me" defense gets you nowhere: otherwise, you could always claim "It wasn't me, it was my gun / knife / fist".) If instead this is a badly-designed pig-slaughtering drone, then it could be manslaughter in the first degree, if the act was reckless, or manslaughter in the second degree, if the act was with criminal negligence. To determine which it is, you look at the definitions: A person is reckless or acts recklessly when he or she knows of and disregards a substantial risk that a wrongful act may occur and his or her disregard of such substantial risk is a gross deviation from conduct that a reasonable person would exercise in the same situation. versus A person is criminally negligent or acts with criminal negligence when he or she fails to be aware of a substantial risk that a wrongful act may occur and his or her failure to be aware of such substantial risk constitutes a gross deviation from the standard of care that a reasonable person would exercise in the same situation. So it would depend on whether you decided that safeguards which would prevent shooting people were too much bother (you know there is a risk and set aside that concern), or it didn't occur to you that a flying gun might hurt a person.
There are both statutes and customs aimed at preventing "Malicious Prosecution" and "Abuse of Process." (In Pennsylvania, for example, the 1980 Dragonetti Act allows the victim of a frivolous lawsuit to counter-sue for compensatory damages.) One can also buy insurance against this type of risk: Umbrella liability policies will generally provide a defense against civil lawsuits and any damages awarded, as will many business insurance policies. Of course, none of this is to say that a skilled legal team can't avoid all of these countermeasures and, in practice, take up a significant amount of your time and trouble. We do not have a perfect system of justice.
Not necessarily. Let's say the victim delivered photos of a harm that were alleged to be done by the defendant. That's a crime in itself. But based on this item the DA orders investigation and finds evidence of a real crime. Discovering that the photo was faked can lead to dismissal (with prejudice), but even without the fake photo, there might be a strong case against defendant. Also, the photo could not even be used as evidence in the actual trial stage. A good defense attorney might manage to convince the judge, that the doctored photo should have been discovered such early in the investigation, but I doubt, that one could manage to make everything else in a proper investigation fruit of the poisoned tree unless police screwed up.
They have the same standard of proof but different onus The legal system places the onus of proving an allegation on the person making the allegation. For your example, this is A if they are suing B or the government prosecutor if B is being prosecuted. The standard of proof is “beyond reasonable doubt” if B is defending a criminal prosecution and “balance of probabilities” if B is defending a civil prosecution or a lawsuit. Courts have historically been reluctant to define these terms further because doing so can lay grounds for an appeal if the judge oversteps so they mean what their plain English formulation means and what they mean precisely in any given case is one of the things the trier of fact has to decide. For A or the prosecutor to win, they have to meet this burden for each and every element of the offence or cause of action; if they don’t, then B wins. So, B doesn’t have to offer a defence at all and will still win if A doesn’t meet their burden. If B does offer a defence then the trier of fact compares the evidence of each side and decides which they prefer and therefore whether A has met their burden. A jury doesn’t have to give reasons for their decision; a judge does. In general, the decisions of the trier of fact are not appealable unless there was no reasonable basis in evidence to support the decision. For example, the evidence of B might not be believed - this is fine, unless the reason for not believing it is that B has a beard and everyone with beards are liars. Options 2 and 3 are simple matters of comparing evidence and deciding which is preferred. Option 1 is different; it is what’s called an affirmative defence. Here, A has met their burden because B conceded. Now B is relying on the position that they had a legal excuse, that is B is alleging a position and B has the burden of proving it. Now, the burden on B is always “balance of probabilities” because B is not alleging that anyone committed a crime so they don’t have to reach the criminal standard.
The standard of proof for civil cases in Texas is generally &quot;preponderance of evidence&quot;. See in re Steven Lipsky for some discussion. The applicable evidentiary standard is generally determined by the nature of the case or particular claim. Criminal cases require proof beyond a reasonable doubt, a near certainty, whereas civil cases typically apply the preponderance-of-the-evidence standard, that is, a fact-finder’s determination that the plaintiff’s version of the events is more likely than not true. Some civil claims, including some defamation claims, elevate the evidentiary standard to require proof by clear- and-convincing evidence. See Sec. 171.208 of SB8. There is no specific statutory specification of the evidentiary standard, therefore the standard is &quot;preponderance of evidence&quot; (compare Lipsky: the issue is that the statute refers to &quot;clear and specific evidence&quot; which is not defines in the statute or elsewhere, hence that lawsuit).
What you are describing seems to raise the defense of necessity. I cannot pinpoint the line for you or tell you whether any particular action would lie on one side or the other, but I can describe the test. In Maryland, there are &quot;five elements necessary to consider before applying the defense of necessity&quot; (Marquardt v. State, 164 Md. App. 95, 135-36 (2005), citing Sigma Reproductive Health Center v. State, 297 Md. 660, 677-79 (1983)): The harm avoided — this need not be physical harm but also may be harm to property as, for instance, where a firefighter destroys some property to prevent the spread of fire which threatens to consume other property of greater value. The harm done — this is not limited to any particular type of harm but includes intentional homicide as well as intentional battery or property damage. An illustration is supplied: `[A]s where A, driving a car, suddenly finds himself in a predicament where he must either run down B or hit C's house and he reasonably chooses the latter, unfortunately killing two people in the house who by bad luck happened to be just at that place inside the house where A's car struck — it is the harm-reasonably-expected, rather than the harm-actually-caused, which governs.' Intention to avoid harm — to have the defense of necessity, the defendant must have acted with the intention of avoiding the greater harm. Actual necessity, without the intention, is not enough. However, an honest and reasonable belief in the necessity of his action is all that is required. The relative value of the harm avoided and the harm done. The defendant's belief as to the relative harmfulness of the harm avoided and the harm done does not control. It is for the court, not the defendant, to weigh the relative harmfulness of the two alternatives. To allow the defense the court must conclude that the harm done by the defendant in choosing the one alternative was less than the harm which would have been done if he had chosen the other. Optional courses of action; imminence of disaster. The defense of necessity applies when the defendant is faced with this choice of two evils: he may either do something which violates the literal terms of the criminal law and thus produce some harm, or not do it and so produce a greater harm. If, however, there is open to him a third alternative, which will cause less harm than will be caused by violating the law, he is not justified in violating the law. For example, &quot;[a] prisoner subjected to inhuman treatment by his jailors is not justified in breaking prison if he can bring about an improvement in conditions by other means.&quot; Marquardt at 137: in order for the defense of necessity to have been warranted in this case, appellant must have presented &quot;some evidence&quot; that there was a choice between two evils, that no legal alternatives existed, that the harm appellant caused was not disproportionate to the harm avoided, and that the emergency was imminent.
The main source of liability would be "for injuries caused by the act 'of things that he has under his guard'" (this article). As stated in Art. 1383. of the 1804 Civil Code, "Everyone is liable for the injury he has caused not only by his act, but also by his negligence or imprudence". Then the question is whether the teacher was negligent in allowing a poisoning to happen. It is much more difficult to judge French standards, since court rulings do not generally create legal principles. To take two extremes, suppose on the one hand that a teacher were to store a bottle of sulfuric acid on the table where anyone could take it. Knowing that some rapscallion might take the bottle and prank someone with it, the teacher might have neglected her duty as a teacher to safeguard students. However, if it is safely locked up and yet someone manages to get into the locker (e.g. they have a safe-cracking device that nobody expects a student to have access to), then she probably would not be liable. The difference comes from whether there is fault in the teacher's choices of action, that is, is that choice something that a reasonable person would know is wrong. It's not clear from the description how Bob got the substance: finding a means of preventing students from accessing dangerous materials should be the main goal, and probably does not require stopping experimentation. But facts about the school might imply that the risk is not practically controllable (e.g. no locks on the chemical cabinet).