What laws apply to Visa holders in the US? I'm a French citizen currently staying in Los Angeles for studies under an F1 Visa. I was told that in the US, only federal law applies to foreigners which is why despite Pot being legalized in California I was told that I am forbidden from buying/consuming it. So I am wondering, what laws do apply to me? Do I have to comply with State laws? What if State and Federal laws contradict each other?
All laws (federal, state and local) apply to everybody, unless you have diplomatic immunity. That is, unless e.g. the federal government decides as a matter of policy to ignore certain federal laws. California does not have a law generally prohibiting the use of marijuana, though public consumption is illegal, minor consumption is illegal, and possession over 28.5 grams is illegal. So that is one less law to be concerned with violating. The federal law still exists, and has not been repealed for anyone. However, the federal government by policy is not pursuing marijuana cases in legal contexts in those states that have legalized marijuana. The complication for foreign students is that there are also immigration laws whereby you may be deported for a drug offense (that link is full of technical details on immigration and drug laws, worth reading). The immigration laws basically make it easy to penalize a foreigner (for example you might be deemed "inadmissible" so you cannot be re-admitted to the US if you leave; it just depends on what their grounds are for action). For example, "a noncitizen is inadmissible as of the moment that immigration authorities gain substantial and probative 'reason to believe' the noncitizen has ever participated in drug trafficking," which does not mean a conviction. It is reported that in California, DHS officers have treated minor infractions as "convictions," which means to be safe you have to avoid even infractions. It appears (and hire an immigration attorney if you want to test this) that trouble only arises if there is reason to believe you are trafficking, if you are a drug addict or abuser, if you are "convicted" (not necessarily "tried and found guilty," it also includes certain legal maneuverings), or if you admit to drug use (even in the case of home use under doctor's orders, i.e. a California-legal context). This incidentally includes non-use but working for the marijuana industry. It is possible that you could get stopped on the street by a random immigration search, and if you are in possession, then... it is not guaranteed that possession of a small amount of marijuana, when caught by federal authorities, cannot lead to immigration problems.
There are nuisance lawsuits and constructive eviction arguments--you can check with your local attorneys and perhaps tenants' rights organizations for detailed information. Just because marijuana is legal under state law (if certain steps were followed) does not mean that your landlord or another tenant can interfere with your use and enjoyment of your home. Civil consequences--such as a court order to the smoker to stop smoking, money damages, or a partial abatement of your rent until the smoking stops--may be achievable. It is important to follow the rules for your jurisdiction closely when starting a legal action, so you should talk to an expert in your jurisdiction if you want to pursue legal action. But where possible, most people deal with this kind of thing by moving.
Legally, they cannot just nab you. The usual (?) option is that authorities in the US request extradition pursuant to the US-Mexico extradition treaty via the Department of Justice, and if the paperwork is in order, this can result in a Provisional Arrest Warrant (and arrest) in Mexico, which will be carried out by the Mexican federal police. This is true whether or not you go to the US consulate. After a hearing in the Mexican courts you might be extradited (or not, but DoJ presumably doesn't proceed with cases that they will lose). Extradition is not possible for every offense, so you would have to look at the offenses listed in the treaty, and whatever the Arizona warrant is about. You can't be extradited for parking tickets, you can be extradited for murder: whatever it is, it has to be a crime in both places, and has to be subject to a minimum one year imprisonment. Also, if you are a Mexican citizen as well, you cannot be extradited unless the Mexican authorities agree to (whereas there is no choice if you are only a US citizen). An alternative is deportation, which would overcome limitations related to extradition, but it's not clear what the requirements for deportation from Mexico are (typically illegal presence, unclear whether Mexican authorities can or would try an end-run around official extradition procedure). Although consulates enjoy a degree of immunity from local law, a consulate in Mexico is still Mexican territory, subject to Mexican law. If you are in the consulate, Mexican authorities cannot enter without permission to arrest you. They also cannot arrest you without a warrant (see Art. 16 of the Mexican constitution). Consular staff also cannot arrest you (if you are not caught flagrante delicto). Nor are they authorized to execute a US warrant in Mexico (thus they have to go through the process of judicial review to send you back to the US, and why a Mexican warrant is required). See this Q&amp;A, relevant to the status of embassies: what is relevant to us is that both the US and Mexico operate under the rule of law, so the issues surrounding Syrian refugees in the Syrian embassy do not arise here.
Growing marijuana is very often legally classed as "manufacture of a controlled substance." In criminal law, "manufacture" tends to be explicitly defined to include cultivation, but this is in fact a reasonably common use of the term (it doesn't have to mean producing with machinery). And so it's extremely unlikely that anyone will be convinced that you even might have thought the agreement didn't cover growing marijuana. The intent of the parties is fairly clear there.
I do not know the particular legal environment in France, but in general the shop is private property and the owner decides who may enter and who may not. You have no right as such to enter somebody else's property against their will. Doing so would at least be classified as trespassing, possibly more serious considering you mention using force to enter the premise.
The only really authoritative source of answers is a court interpreting the laws on an as applied basis (and there are many U.S. traffic laws, one in every state and sometimes additional local ones, not a single U.S. traffic law). An answer from a government official or police department is not authoritative, although it may be informative of how the official in question would enforce the law.
Yes, and this is very common - Cuba, North Korea and Iran are often excluded. Mind you, this is from a US perspective. The banned country may have other ideas about the legality of the ban under its laws. But if you weren't planning to do business with that country anyway, that's not exactly going to hurt you.
The newly-reinstated presidential proclamation says (Sec 3(b)) says The suspension of entry pursuant to section 2 of this proclamation shall not apply to: (i) any lawful permanent resident of the United States; The State department also lists exceptions to the travel ban on 8 countries, identifying those who "will not be subject to any travel restrictions listed in the Proclamation" d) Any lawful permanent resident (LPR) of the United States; Requesting / receiving a passport (or renewed passport) from your current country of citizenship does not invalidate your permanent resident status. Additionally, State says No visas will be revoked pursuant to the Proclamation. Individuals subject to the Proclamation who possess a valid visa or valid travel document generally will be permitted to travel to the United States, irrespective of when the visa was issued. If you stay out of the country too long, that could cause a problem. If you plan to stay away more than a year, you have to first apply for a reentry permit. This is the current state of the law, which is subject to change.