Is perimeter search without a warrant ever legal? Are perimeter searches without consent nor warrant ever legal? What if it's a motor vehicle / car? Is the situation different with a house?
Huge difference between a car and a house. For example, at least in Pennsylvania no warrant is required to search a vehicle on public roads. In other states there are so many easy pretexts that you practically have little protection from a full vehicle search (although the pretext will have to withstand strict scrutiny if evidence found in a search is used to charge you with a crime). Your house, on the other hand, still enjoys very strong fourth-amendment protections: One of my favorite U.S. Supreme Court cases on the subject is Florida v. Jardines, in which SCOTUS ruled that even approaching the front door with a drug-sniffing dog without a warrant constituted an illegal search. (The majority opinion is worth reading for its illumination of current law on this question.)
Short answer: Maybe. Long answer: The answer here varies from jurisdiction to jurisdiction. Normally, the process goes like this: The application for the warrant is usually made under seal or otherwise in secret to prevent the target from trying to hide evidence. So before it's been executed, you can pretty much forget about accessing it. After the warrant is executed, though, there are differing answers to this question. The Supreme Court gave us a test for this kind of question in Press-Enterprise II, which held that the First Amendment gives us a qualified right to access court proceedings and records. The right applies when public access makes sense using the "experience and logic" test: Has the Anglo-Saxon experience typically been to provide access, and does logic tell us that access has beneficial effects for the judicial process? But lower courts have disagreed about how to apply the test. The Eighth Circuit allowed access to warrants in a defense-industry corruption investigation in In re Search Warrant for Secretarial Area-Gunn, but the Ninth Circuit denied access in to warrants in the same investigation in Times Mirror Co. v. U.S. I think, though, that the Ninth Circuit decision would have come out differently if the investigation had already ended. Just to mix things up further, the Fourth Circuit has also allowed access, but based on common law principles of access, rather than the First Amendment. That was Baltimore Sun Co. v. Goetz. Same in the Second Circuit: In re Application of Newsday, Inc. Individual states also have their own rules, but those are of course subject to limits under the First Amendment. When I wanted a copy of a warrant, I would go first to the clerk of the court whose judge signed the warrant. I would tell them what I was looking for, and I pretty much always got it. I would rarely submit a FOIA request, especially if the warrant was issued by a federal agency. Those requests sit in a queue for months or years without being reviewed, and the agency virtually always denies the request anyway. When law enforcement agencies and courts have copies of the same record, you're almost always going to have better luck getting access from the courts, which are set to open by default. If the court denies the request, try again after there's an indictment, and again after the trial.
To be very straightforward, yes, a police department would very likely have records of their past interactions with you in the form of police reports. They cannot just throw them away because it's been scrubbed from your public record. They detail the interactions the police officer had with you. That being said, those records would not show up in a general inquiry into your record, because those records are meant to protect the officer and the department as a reference point they can go back to in case some dispute arose in the future. If a police officer really wanted to find them, they'd have to do a bit of digging for them. The difficulty in finding them would depend on what system the particular police department uses to store those records. Smaller departments may just file them in a cabinet somewhere, whereas larger ones may actually have their own searchable database. But a traffic cop out on the street is only gonna see what you're seeing at the DMV - nothing. There is also a formal NCIC database, but traffic violations would never end up in there. That is a national database that basically stores red flag persons of interest (think stolen vehicles, sex offenders, and gang members). Sometimes multiple departments within a state will share their information with each other, but a department's database is usually kept to that department only. Also keep in mind court records. The court case that had a violation removed under such and such conditions is still gonna be a public record. Those records would generally be available to a judge overseeing your case so if you repeatedly end up in court for the same thing, they're gonna know and they're gonna stop scrubbing it from your record or offerring certain options because you're clearly not learning your lesson. Many laws allow you to have one offense stricken per year and similar stuff like that, but that kind of stuff doesn't just permanently disappear. They have to keep record of it in order to know you've already had your once per year etc. Also a note about parking violations: not all of those are actually issued by police. If it was issued by a private firm then that is not something that would ever show up on your record. It would just be in a database somewhere with whatever private firm issued the fine. Those kind of tickets get sent to collections and hurt your credit score if you don't pay them, rather than affecting your driving record.
The IRS Criminal Investigation division is typically going to be the arresting agency, assuming that (1) the offense is treated as a criminal matter; (2) a warrant is actually issued; and (3) anyone actually sets out specifically to serve the warrant. It is usually the case, though, that the violation is handled as a civil matter. When it is treated as a criminal violation, the defendant and the Service often reach an agreement that eliminates the need for an arrest. If there is a warrant, though, any police agency could theoretically make the arrest if they happened across the defendant. But if it's a time-sensitive investigation -- if the defendant is expected to flee or destroy evidence, for example -- it's a safer bet that you'll see an actual warrant execution. In that case, you would have CI taking the lead, perhaps with assistance from other agencies.
It isn't clear that the example you give is illegal police action, but let's assume that it is for the sake of this question, since it doesn't affect the analysis. If possession is not compelled, then it is voluntary.
If you consent, the evidence can almost certainly be used against you. Florida v. Bostick, 501 U.S. 429 (1991) (&quot;Even when officers have no basis for suspecting a particular individual, they may generally ask questions of that individual, ask to examine the individual's identification, and request consent to search.&quot;) If you refuse consent, it is not clear whether the evidence can be used against you, as we don't know why the officer is asking to frisk you. A stop-and-frisk must be supported by a reasonable and articulable suspicion that you have just committed or are about to commit a crime, and that you are at that moment armed and dangerous. If they reasonably suspect you have just committed a crime but do not reasonably suspect you are armed and dangerous, the police may stop you, but they may not search you. That point is worth emphasizing because several other answers are incorrectly assuming otherwise. For one example, in Thomas v. Dillard, 818 F.3d 864 (9th Cir. 2016), the police responded to a report of domestic violence. Based on their reasonable and articulable suspicion that the suspect had committed that crime, the police stopped and frisked him. Because they had could reasonably explain why they thought he had committed a crime, but could not reasonably explain why they thought he was armed and dangerous, the court said the stop was legal, but the frisk was not: Whereas the purpose of a Terry stop is to further the interests of crime prevention and detection, a Terry frisk is justified by the concern for the safety of the officer and others in proximity. Accordingly, whereas a Terry stop is justified by reasonable suspicion that criminal activity may be afoot, a frisk of a person for weapons requires reasonable suspicion that a suspect is armed and presently dangerous to the officer or to others. A lawful frisk does not always flow from a justified stop. Rather, each element, the stop and the frisk, must be analyzed separately; the reasonableness of each must be independently determined. Even then, the search is basically limited to a minimally intrusive patdown to ensure you don't have any weapons on you, and the officer is generally not permitted to actually search inside pockets or the like, though the search may escalate based on what the officer is able to feel during the patdown. Minnesota v. Dickerson, 508 U.S. 366, 375–76 (1993) (&quot;If a police officer lawfully pats down a suspect's outer clothing and feels an object whose contour or mass makes its identity immediately apparent, ... its warrantless seizure would be justified by the same practical considerations that inhere in the plain-view context.&quot;) The refusal to respond generally operates as a refusal to consent. The police are therefore free to conduct whatever search they could have conducted without your consent. If they have a reasonable, articulable suspicion that you're carrying a gun, they can probably frisk you to see if that's the case. If they have a warrant to search your pockets, they can search your pockets. If they don't have any of that, they need to keep their hands to themselves.
There is a lot of confusion over the difference between reasonable suspicion and probable cause. They are not the same thing. Reasonable suspicion is any justifiable belief that a crime has been or is about to be committed. Probable cause requires an officer to have actual, tangible evidence that you have committed a crime. Only after probable cause has been established can an officer arrest you (with limited ability to search your immediate person and effects). Reasonable suspicion only requires some articulatable justification that you did something wrong. The police can detain you on reasonable suspicion, and they do not have to tell you why. This is called a Terry stop (after Terry v. Ohio where the Supreme Court ruled this was legal). However, they can only detain you long enough to ascertain whether or not they have probable cause to arrest you. If after conducting a preliminary investigation they can't find probable cause to make an arrest, they have to let you go. In that video, we have a guy walking around in Texas with a shotgun and some shells. We never see what this guy looks like or how he's carrying himself, but he appears to be a troll. The cops received a call, so they investigated. They had all the reasonable suspicion they needed to detain him. Texas is an open carry state (a person can walk around openly with a gun), and it is not a stop-and-identify state (the police cannot demand that you ID yourself). Therefore the man did not break any laws. But neither did the police officers. They were doing their job by asking questions, and after failing to find any evidence, they let him go. If he had run before the officers had cleared him to leave, they could have chased him down and arrested him. That is, after all, what a detention is. You don't get to run away because you don't recognize a cop's authority to stop you. And fleeing a law enforcement officer is a crime. But you do have the right not to answer any questions, including (in some states) what your name is.
There are two very important points you should keep in mind here: You are not under any obligation whatsoever to investigate the owner of a vehicle parked on your property. You have full rights to tow any unauthorized vehicle off of your property. So, by far the easiest thing for you to do is to shift all responsibility off of yourself. Make it somebody else's problem. Try the police first. The safest thing you can do is simply dial 911 (or try to find a non-emergency number if you live in a major city, but Nebraska suggests just calling 911 directly) and report the abandoned vehicles to police. Their process for declaring a vehicle abandoned can take a bit longer (takes seven days in Nebraska). Essentially they'll document the vehicles' location and tag them, and probably run the license plates (if they come back stolen, they'll be towed by law enforcement immediately). Then they'll come back seven days later and, if the vehicles are still there, have them towed as abandoned vehicles. Law enforcement will sometimes only respond to private parking complaints that are actually on paved surfaces, and it sounds like these vehicles are just parked out in the middle of a field somewhere, so they may not actually care. But it doesn't hurt to check. If that fails, just have it towed. If law enforcement says it's ok or doesn't care about the vehicles, the next easiest thing for you to do is to call around to different tow companies, and see if one will tow it off your property for free in hopes of recovering tow costs and other fees from the actual owner of the vehicle, or through sale of the vehicle if it's never claimed. Let them do all the research and contact the owner, or report the vehicle to the police if necessary. You don't need to do any of the work yourself. Sure that doesn't get you any money, but any scenario that gets you money will be a very long process and it sounds like you just want the vehicles gone. You do not own the vehicles. The previous owner saying you bought the vehicles with the land is blatantly wrong. Ignore him, completely. By that logic, someone buying an apartment complex would subsequently take ownership of all vehicles on its private parking lot. That's not how vehicle ownership works in any state, and you do not own the vehicles, nor do you have any right to dispose of them. Even if the vehicle is abandoned, there is still a legal process that must be followed to claim ownership of an abandoned vehicle with the state. Unless you really want to take ownership of the vehicle, those processes are probably way more time and effort than you're willing to expend (usually resulting in years of waiting). Taking it to a scrap yard could be very bad for you. Since you do not have ownership of the vehicles, you definitely should not take them to a scrap yard. Destroying the vehicles without giving a person the chance to come claim the vehicles could get you into a lot of trouble. You're basically destroying someone else's property. If the person came back looking and found out you destroyed them, they may even be able to press charges against you, the scrap yard, or a combination of both (a Class IV felony in Nebraska, since vehicles are worth more than $1500). As an aside, any legitimate and reputable scrap yard should outright refuse to destroy the vehicles for you, because you won't be able to provide them with any documents that verify your ownership of the vehicles. Make sure you don't destroy the vehicles in any other way, though. Again, shift the responsibility. Don't put yourself into situations if you don't have to. Law enforcement and tow companies deal with this stuff every single day, and are much more qualified to handle this situation in a legal way than you are. Let them take all the responsibility off of you, and don't worry about doing anything yourself. It will make sure you don't do anything illegal, and thus don't open yourself up to repercussions later on down the line.