Are the police legally obligated to report an illegal immigrant who reports a crime? Say that a person is an illegal immigrant in the United States and a crime is committed against them, such as robbery, domestic abuse, etc. If they report the crime to the police, and a police officer discovers that the person is an illegal immigrant, do they have a legal obligation to report them? Or does being the victim of a crime give them some sort of immunity against this? This question is prompted by the beginning of story on the radio about how illegal immigrants who were victims of domestic abuse were afraid that they would be deported if they went to the police. I didn't hear enough to know if their concerns were justified.
"Police" that one would generally encounter in the US are local or state agencies, and the ordinary crimes you mentioned are matters of state law, so they would be reported to local or state police. (There are federal law enforcement agencies, but they only deal with specialized areas of federal law, and you wouldn't ordinarily encounter them in daily life.) On the other hand, immigration is a matter of federal law. The responsibilities of local or state police are governed by state law, and the federal government cannot compel state officers to enforce federal law. A specific state's law could potentially require state and local police to ask about people's immigration status and/or ask the federal government to check on the status of someone they suspect might be illegal. I believe a few red states have enacted, or are considering, such laws, though they usually deal with people stopped by police rather than people filing a report. Some of these laws have been challenged in court, and I am not sure which exact parts of which laws are still being implemented for each of those states. Most states do not have such laws.
Police officers are authorized to use force regardless of what they are wearing, to effect an arrest. One issue will be whether the defendants should know that they were under arrest, but there is no requirement to utter particular phrases when dealing with a combative lawbreaker. There will be an internal investigation at some level to determine whether the officers violated any department policy, and no doubt the video and testimony of those in the are would be relevant. There probably is some policy to the effect that you have to distinguish yourself from a street vigilante (you have to state your authority), though I can't find any specific online publicly-available department rules. There is no law that requires an officer to say that he is one, or to show his badge, before starting an arrest.
Is it the case that Police in the US are unable to proceed with a charge if a victim declines to &quot;press charges&quot; and if so, how are murder charges or even more pertinently, domestic violence charges, brought to court? First of all, it is prosecutors and not police officers who actually bring criminal charges in the legal systems in the vast majority of U.S. states (although not quite all, minor offenses in Rhode Island, for example, are an exception). Second, a prosecutor does have the right to bring criminal charges even if the victim or someone affiliated with the victim does not &quot;press charges&quot;. Indeed, a prosecutor can almost always bring criminal charges over the objections of a victim, although &quot;victim's rights&quot; protections in some U.S. states require a prosecutor to confer with a victim before doing so. This said, law enforcement and a prosecutor cannot prosecute a criminal case if they have no knowledge that a crime was committed, so if no one brings a crime to the attention of authorities it is unlikely to be prosecuted. And, law enforcement and prosecutors will defer to the wishes of a victim that charges not be pressed in the legal system against an offender in many kinds of cases (although that discretion is limited in many states in domestic violence cases by statute).
A punishment is basically a harm to someone's person, liberty, dignity, or property imposed primarily for the purpose of harming someone, rather than to accomplish some non-punitive end such as apprehending a suspected criminal, securing compliance with a court order, exchanging truthful facts, or compensating someone for harm legally attributable to the person upon whom the act is imposed. If a police officer shoots and kills a person while they are in the process of committing a crime, that is not a punishment, because the officer is not trying to punish someone for committing the crime, but to prevent the crime from continuing and/or to apprehend the suspect. If the use of force is justified by a law authorizing it under the circumstances, then it is legal and there are no civil or criminal consequences. If the use of force is not justified by a law authorizing it under the circumstances it might be a crime, it might be a &quot;tort&quot; (i.e. a civil wrong for which you can sue someone, especially if it arises at common law), or it might be a civil rights violation. Law enforcement officers generally have broad absolute immunity from common law tort liability incurred the course of their duties in carrying out their jobs, and have &quot;qualified immunity&quot; from liability for civil rights violations which limits their liability to cases of intentional violations of clearly established constitutional rights. In a case arising from an excessive use of force against someone who is not in custody, generally speaking, the constitutional right violated is the 4th Amendment right to be free of unreasonable seizures and to be free from seizures that that are not supported by probable cause. Generally speaking, the law does not recognize an excessive use of force in connection with the criminal justice system as a &quot;taking&quot; for which there is a right to both due process and fair market value compensation (to somewhat oversimplify). Generally speaking, an 8th Amendment analysis involving the use of force (as opposed to taking of money or property in the criminal justice system which are subject to the excessive fines clause of the Bill of Rights), begins, and the 4th Amendment seizure analysis ends, when someone is in custody. A police officer who arrests someone and then beats them up or rapes them and then releases them, might be entering into 8th Amendment, rather than 4th Amendment territory, although the dividing lines are not always clear.
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.
No. Police are not permitted to impose any punishment whatsoever. Their role in the American justice system is to prevent and investigate criminal offenses. What you're describing is a punishment for a criminal offense, even though it is imposed outside the criminal justice system. The same principles that prevent an officer from punching a suspect in the face or demanding a cash payment to not write a ticket prohibit a police officer from imposing a punishment of his own design, with or without your consent.
How much would I be expected to reveal if not directly connected to the case? For example, if I was asked, &quot;What were you doing in the alley at night?,&quot; would you be required to reveal the information if it is potentially humiliating (e.g. you were having an affair) or illegal (e.g. you were getting illegal drugs)? The latter case seems to violate the protection against self-incrimination. Or what happens if you just lie about something inconsequential? You have to answer any permissible questions (i.e. consistent with the rules of evidence) asked. If you were doing something illegal you can claim the fifth and not testify unless you are given &quot;transaction immunity&quot; that your testimony will not be used against you in a criminal case against you. Usually perjury prosecutions require that the lie be about a material fact. Suppose you receive a death threat (either verbal or in writing) from the person charged with and who committed the crime. Something along the lines of: if you testify against me, then my friends will kill you after the trial. What legal options do you have? Tell the prosecutor on the case and ask the prosecutor to provide protection to you and to go after the people making the threat. The witness protection program was created for these cases.
The misunderstanding The only person who can chose to prosecute or not to prosecute a criminal case is the state: in the US this is through the office of the relevant District Attorney advised by the police. When a person makes a complaint to police (or other authorities), the police/DA commence an investigation. In an ideal world all complaints would be investigated rigorously and thoroughly, however, we live in this world. The police/DA will assess the complaint and decide if it warrants the dedication of scarce resources to investigate. One of the factors they will consider is how vigorously the complainant prods them in the ass. Ultimately, the police/DA will decide if there is enough evidence to place the matter before the courts. The complainant has no say in when or if this will happen. A complainant cannot "drop the charges"! The misconduct For a police officer to disclose to another police officer that they were the subject of a felony (or any) complaint is gross misconduct and a huge betrayal of trust. At best it shows poor judgement, at worst it is corrupt. Your friend needs professional legal advice right now!