Breaking Laws in Different Jurisdictions I am a citizen of the United States of America. As such, it is illegal for me to--to take an extreme example--murder. However, say I am going on vacation to a little nation where it is not illegal to murder--if you decapitate someone for stealing your oranges, the only thing that you'll have to worry about is the cleanliness of your machete. So I am in this country when another adult cuts me in line for the roller coaster. Naturally taking this personally and as an insult, I take out my machete and swing at my adversary; after realizing that I missed the cutter altogether, I pull out my revolver and shoot my opponent, and he dies. I have just murdered a man; however, because murder is not illegal in this country, I have done nothing (from the law's perspective) wrong. Upon returning to the US, of which I am a citizen, can I be tried for murder even though I did not do it in the US's jurisdiction? Does this apply to all actions that are unlawful in one jurisdiction but not another? Thanks a lot in advance for any responses. All are greatly appreciated!
What you're asking about is extraterritorial jurisdiction, and it will depend on the country and crime(s) involved. As an example, under Australian law, it is a crime to engage in sexual activities with minors barring specific exemptions, which are not relevant to this example. There are countries where the age of majority is less than that in Australia. If you were to travel to this country, you are not necessarily committing a crime there. However, Australia's sex tourism laws make it a crime to do this anywhere in the world. This is enacted (I believe) under the foreign affairs power of the Commonwealth Government. It will largely depend on the legal system of your country, as to whether laws have extraterritorial effect. In general, however, laws do not have extraterritorial effect unless explicitly stated.
You can be prosecuted for the crime in the U.S., both at the federal level and at the U.S. state level (or both), completely without regard to what happened in the criminal justice process elsewhere. This is true in all of the scenarios you pose, for any offense, and with or without an extradition treaty (of course, unless the treaty had some anomalous provision to the contrary or deprived the U.S. of jurisdiction by statute rather than constitutionally of this crime). The U.S. Supreme Court determined in Heath v. Alabama, 474 U.S. 82 (1985) that the double jeopardy clause of the U.S. Constitution is applied separately with regard to each sovereign involved and that each state and the federal government count as separate sovereigns. In the pertinent part, it states: The dual sovereignty doctrine is founded on the common law conception of crime as an offense against the sovereignty of the government. When a defendant in a single act violates the &quot;peace and dignity&quot; of two sovereigns by breaking the laws of each, he has committed two distinct &quot;offences.&quot; United States v. Lanza, 260 U. S. 377, 260 U. S. 382 (1922). As the Court explained in Moore v. Illinois, 14 How. 13, 55 U. S. 19 (1852), &quot;[a]n offence, in its legal signification, means the transgression of a law.&quot; Consequently, when the same act transgresses the laws of two sovereigns, &quot;it cannot be truly averred that the offender has been twice punished for the same offence, but only that by one act he has committed two offences, for each of which he is justly punishable.&quot; Id. at 55 U. S. 20. In practice, the U.S. Justice Department and most state and local prosecutors are disinclined to prosecute a crime that has already been handled by another jurisdiction and often have official, but non-binding, policies to that effect. In part, this is because an acquittal in one jurisdiction makes it likely that it is a weak case, while a conviction in one jurisdiction often constitutes sufficient punishment. There could be an issue under the 8th Amendment to the U.S. Constitution (cruel and unusual punishment) over whether a punishment imposed in a U.S. conviction for a crime needs to consider the already severe punishment imposed in another jurisdiction for the same crime in order to prevent the cumulative punishment from being cruel and unusual. But, I am not aware of authoritative case law that resolves that constitutional question. Certainly, evidence of a prior punishment for the same offense could be presented at a sentencing hearing following a conviction in mitigation of the punishment that should be imposed. Indeed, in some states time served pursuant to a conviction for the same crime in another jurisdiction might statutorily count as &quot;time served&quot; for which the defendant is legally entitled to credit at sentencing.
There are venue restrictions where political speech is restricted, such as on military bases; content restrictions (transmitting classified information to the world); you cannot defraud by saying false things in order to get something, you cannot defame a person, you cannot speak obscenely (though it's hard to tell what counts as "obscenity"). You cannot appropriate other people's property in speaking (i.e. copyright law is a restriction on speech). The type of speech restrictions seem to pertain to speech and violence caused by such speech. A classic limitation is that you cannot speak "fighting words" (Chaplinsky v. New Hampshire 315 U.S. 568), which in 1942 meant calling someone a "damned racketeer" and "damned Fascist", which the court characterized as "inherently likely to provoke a violent reaction". The court subsequently refined its position on "provocative" speech. In Virginia v. Black 538 U.S. 343 a law against cross-burning was found to run afoul of the First Amendment as a restriction on political expression, but it would be fully consistent with The Constitution to outlaw "cross burning carried out with the intent to intimidate". This states may "prohibit only those forms of intimidation that are most likely to inspire fear of bodily harm". The current position is that you cannot incite to the imminent use of force. In Brandenburg v. Ohio 395 U.S. 444, the court stated that the First Amendment does not "permit a State to forbid or proscribe advocacy of the use of force or of law violation except where such advocacy is directed to inciting or producing imminent lawless action and is likely to incite or produce such action". There are myriad laws against threats, for instance in Washington you may not "knowingly threaten(s) to cause bodily injury immediately or in the future to the person threatened or to any other person", and you can't do that ("knowingly cause another to believe that the offender will cause serious physical harm to the person or property of the other person") in Ohio either. You can't get away with threatening "to commit a crime which will result in death or great bodily injury to another person" in California. This class of restrictions on speech seems to be quite robust. You may not induce panic in Ohio, e.g. shout "fire" in a theater -- I don't know if any other state has such a law.
I don't believe your premise is necessarily true. As the Supreme Court has held, a defendant can be prosecuted for perjury after being convicted for another offense at trial: The conviction of Williams, at a former trial, for beating certain victims is not former or double jeopardy. Obviously perjury at a former trial is not the same offense as the substantive offense, under 18 U.S.C. § 242, of depriving a person of constitutional rights under color of law. . . . It would be no service to the administration of justice to enlarge the conception of former jeopardy to afford a defendant immunity from prosecution for perjury while giving testimony in his own defense. United States v. Williams, 341 U.S. 58, 62 (1951) (emphasis added). Now as a practical matter, trying a convicted person for perjury is most likely rare, since the prosecutor has already obtained a conviction for the underlying offense. Starting another prosecution for perjury might be excessive or unnecessary. But that doesn't mean it's categorically prohibited. Note also that perjury by the defendant can be considered by the judge to enhance the defendant's sentence. United States v. Dunnigan, 507 U.S. 87, 96 (1993).
Yes, because the crimes are different instances. Let's remove the guilty plea and the fact that it is murder: can a person assault a person, be tried and imprisoned, then assault the same person later – and get off by declaring "Double jeopardy!". No, it's not the same crime. It's the same type of crime, and involves the same victim, but it is still a different crime. The same with your proposed scenario. (Incidentally, your first line is wrong: the woman wasn't murdered, she was thought to have been murdered).
Not for that reason This would not make the Act invalid. The interaction between the two laws would simply mean that criminal prosecution would only succeed for acts on or after the Act came into effect. So, even though the law purports to invoke criminal sanction for acts before it came into effect, the Constitution says it can’t so it doesn’t. That doesn’t render the law invalid, just unenforceable for that period.
This is an interesting hypothetical. In this scenario, Country Z does not have jurisdiction to enforce such a law on foreign nationals, unless Country Z has an extradition treaty with Country A. Generally, however, these types of laws would never be enforced as they are egregious abuses of government, and could possibly be elevated to the International Court of Justice if Country Z actually charges any individuals with such a crime. In these instances, however, war is a very unlikely scenario, since this would often be expensive and any escalation would most likely be small skirmishes that would lead to an eventual ceasefire, with the encouragement of the international community, without the involvement of UN Peacekeeping troops.
Exactly the same thing that stops the same rogue lawyer from putting on a mask and robbing a bank. One is the crime of fraud and the other the crime of armed robbery but they are both crimes. People commit crimes all the time; that is why nearly 1 million people in the U.S. are in jail right now - some of them may even be in there for crimes they actually committed! Were your lawyer to commit this crime he may get caught or he may not; if he does he's going away for a long time and can never work as a lawyer again. So it's simply a matter of risk assessment; oh, and ethics