Under what circumstances can the police detain you? after watching the video about the recent fiasco in Mckinney Texas I was curious about whether any of the teens that the officer pulled over had the legal right to just walk away. Under what scenario is a police officer allowed to detain you? Do they need a reason to believe that you committed a crime, or can they just detain you without any reason at all? If you need a state, use Texas, if you need a city, use McKinney. Please make it clear under what scope the laws actually reside.
Brief detentions and reasonable suspicion You can be briefly detained by police if they have reasonable suspicion that you committed a crime. Terry v. Ohio, 392 U.S. 1 (1968) What reasonable suspicion "means" can only be fully understood by reference to subsequent case law (which I will expand this answer to do), but as a basis, the court said in Terry that: the police officer must be able to point to specific and articulable facts which, taken together with rational inferences from those facts, reasonably warrant that intrusion This standard has been reiterated as recently as in Heien v. North Carolina 574 U. S. ____ (2014), where they say "All parties agree that to justify this type of seizure [a traffic stop, in the case of Heien], officers need only reasonable suspicion — that is, a particularized and objective basis for suspecting the particular person stopped of breaking the law" (internal quotation marks omitted). The reasonable suspicion standard was also used recently in Navarette v. California 572 U. S. ____ (2014). They reiterated that reasonable suspicion is dependent upon both the content of information possessed by police and its degree of reliability, quoting Alabama v. White, 496 U. S. 325, 330 (1990). A mere "hunch" does not create reasonable suspicion, but the level of suspicion required by the reasonable suspicion standard is "obviously less than is necessary for probable cause". Arrests and probable cause To be arrested, police require probable cause. Brinegar v. United States, 338 U.S. 160 (1949) In more detail, probable cause exists (from Brinegar v. U.S.): where the facts and circumstances within the officers' knowledge, and of which they have reasonably trustworthy information, are sufficient in themselves to warrant a belief by a man of reasonable caution that a crime is being committed Also: The rule of probable cause is a practical, nontechnical conception affording the best compromise that has been found for accommodating these often opposing interests. Requiring more would unduly hamper law enforcement. To allow less would be to leave law-abiding citizens at the mercy of the officers' whim or caprice. As in the case of reasonable suspicion, the probable cause analysis is case-by-case and fact-intensive, so to understand the contours of probable cause will require reference to much subsequent case law. In Beck v. Ohio, 379 U.S. 89 (1964) the question before the court was entirely "whether or not the record in the case before us can support a finding of probable cause for the petitioner's arrest". In that case, it turned out that the information they had received about the arrestee was not sufficient for probable cause, but regardless, the test the court applied was whether the police had probable cause for the arrest. Notes While I am confident in the correctness of this answer, what each of these standards means will take hours of work to flesh out, which I plan to do. The courts have repeatedly reiterated and referred to these decisions/standards, but the analysis is very fact-intensive and is done case-by-case. Also, I realize the presentation is a little scattershot, as I'm first just looking to include relevant cases and statements the court has made about these standards, but I'll re-make it into a coherent story every once in a while.
It is possible that there is such a booklet in some jurisdiction, and that local police are required to carry that booklet and show it to persons on demand. This link (apparently) publicly provides the police manual for the city of Seattle, except it is 5 years and a major lawsuit out of date. No provision seems to exist that requires showing authority to detain, when requested. There is no general requirement for all police and all laws, in the US, and the full set of state, county and city codes would be impractical to lug around. If required by law to carry and display some such document, then by law a person can demand to see a police officer's authority to detain. Even without such a law, you have a First Amendment right to challenge the detention, but that does not also enable you to resist arrest. A detention is not invalidated by the fact that the detainee is unsatisfied that the detention is legal.
In the United States, the government has, multiple times, destroyed homes while trying to catch a fugitive. And the homeowner sometimes makes a claim in federal court that this is an unconstitutional taking without compensation in violation of the 5th Amendment. In Lech v. Jackson, the 10th Circuit decided that the police and city were not liable for destroying a house while trying to arrest a criminal who had fled there. The Supreme Court declined to hear the case. But in Baker v. City of McKinney, Texas, less than 3 months ago, a district court declined to dismiss a case in which police destroyed a home to catch a fleeing criminal. Allegedly, in this case the police were given a key to the door, a garage door opener, and the code to the back gate by the homeowner - and instead of using those, they used explosives on the garage door and used a BearCat to knock down the fence and the front door. I'm not sure to what extent those facts, perhaps showing that the scale of the destruction was unnecessary, matter. To the best of my knowledge the case is still ongoing.
Hot Pursuit What you're describing is a hot pursuit, and in the US, common law says that police officers crossing state lines while in hot pursuit is absolutely allowed. An active pursuit is considered an exigent circumstance, which gives police all kinds of temporary powers they don't normally have.
"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.
I think you're being confused by two separate definitions of &quot;police power.&quot; The police power under the 10th Amendment has nothing to do with &quot;the police,&quot; i.e. people with guns and badges and uniforms who make arrests. It refers to the authority of a government to make rules for the general welfare. Police power is almost always exercised by the legislature, and when the executive exercises it (e.g. by issuing regulations) it's typically operating under conditions set by the legislature. The United States has police power in a few situations: DC, federal property and territories, US-flagged ships on the high seas, etc. Outside of those situations, the United States instead has enumerated powers. Congress has a power to tax and spend to promote the general welfare, but otherwise it can only legislate to achieve one of the enumerated powers in the Constitution. Now, courts have read Congress's power to regulate interstate commerce very broadly, but there does need to be some relation to enumerated powers. You're asking about the Capitol Police, but they don't have &quot;police power&quot; in the 10th Amendment sense. They have the power to carry guns and to arrest people for crimes committed against the United States. This power is limited based on geography and/or the nature of their task; for instance, they have nationwide arrest powers &quot;[i]n the performance of their protective duties,&quot; but not when they're traveling outside DC on other official duties (e.g. to attend training). While there's no litigation I can dig up that's directly on point, courts have repeatedly ruled that Congress has the power to do some not-entirely-legislative tasks in order to protect its own functions. For instance, in Anderson v. Dunn (1821), the Supreme Court upheld an inherent power of the House to hold private citizens in contempt of Congress for disobeying its subpoenas and for the Sergeant at Arms to arrest them and bring them before the House. It seems likely Congress would also have the authority to protect its own members from physical violence. The GAO did an analysis when it was analyzing whether there was a constitutional problem with making Capitol Police IG personnel into special deputy US marshals, and it concluded that there was no issue with congressional employees exercising arrest powers in order to physically protect the legislative branch.
D should be subpoenaing anything and everything they need from anyone and everyone, including E. No matter how good terms you are on, if you are involved in a lawsuit you should not be relying on anyone's good faith to supply you what you need. Suppose you ask nicely and they say yes but, for whatever reason, they don't supply them by your court date. Without a subpoena, if you ask for a continuance the judge will say "tough t*^%^$s"; with a subpoena they will say " Yes certainly, oh, and Mr Sheriff, here is a warrant for the documents, go and get them for me please. Oh and a warrant for the arrest of the person who ignored my subpoena." Where do you want to be?
A related post is here. Are police required to record in car dashcam video for traffic tickets in NJ, USA? Probably not. Is there any way to find out if they aren’t telling the truth? Ask and hope you are not lied to. Can I contact the police chief, mayor, or municipal judge? You can contact the police chief or mayor if you can get through to them. They are not required to answer you unless you make a formal discovery request or public records request. You cannot make ex parte contact with a judge when the other side's lawyer (in this case, the city's lawyer) is not present. How can I defend myself in court trial if the judge always believes highly credible police officers over defendants if I don’t have video? You can tell your side of the story under oath with any details that makes your story believable. You are correct that the judge will usually believe the police officer and not you. So, usually you will lose. This is one reason that most people try to plea bargain their traffic tickets, rather than going to trial. Due process rights give you an opportunity to tell your side of the story when contesting a ticket, but it doesn't give you a right to win (even if you are actually in the right) if the judge or other trier of fact doesn't believe what you have to say. It does not appear that you have a right to a jury trial in a traffic case in New Jersey, although this depends to some extent on the kind of violation being charged, so you are probably stuck with the beliefs of the municipal court judge about who is the more credible witness.