Can a police officer ban a person from a public park? Can a Utah police officer ban a person from a public park even if the person is only suspected of breaking the Law?
Utah has a lot of public parks, so to point in the right direction, I will assume that this is a public park in Salt Lake City, it's just a plain old grassy field, and it's not during a special event. A person is suspected of some crime like selling drugs, not arrested, but told by a police officer to go away and never come back. This is way beyond the power of the police. After due legal process, a proven (not just suspected) public menace could be ordered by the court to stay away from the park. A police officer can, of course, order a person to leave a park when they violate a park rule, in fact rule number 1 is "It is unlawful for any person to do or to allow or permit any of the acts prohibited by this chapter in any park in Salt Lake City", so the police cannot legally turn a blind eye to rule violations. Violation of park rules is an infraction which can earn you a ticket of up to $299. However, the officer can tell you to go away, rather than giving you a ticket or arresting you. But an police order cannot issue a unilateral restraining order. Apart from city laws, there are general state laws regarding trespass and destruction of property. The state criminal trespass law says that A person is guilty of criminal trespass if...knowing the person's... entry or presence is unlawful, the person enters or remains on to which notice against entering is given by...personal communication to the person by the owner or someone with apparent authority to act for the owner In this case, the owner is the city, and the officer has apparent authority to act for that owner. In the case of private property, the owner or his agent has very broad authority to give notice requiring you to leave (e.g. if you don't like their politics or their shirt); but in the case of public property, the government has more narrowly circumscribed authority to kick you out.
Police have discretion in the enforcement of the law Which is to say, police get to decide which crimes they make arrests for, which they handle with warnings, which they report and which they ignore. This applies whether they are in uniform, undercover or off-duty. If they abuse this discretion then they are liable to disciplinary action. If they apply it corruptly or otherwise illegally then they are liable to criminal sanction.
It would not work. There is apparently a common misconception in Georgia that this would be the case, based on Article IX, Section II, Paragraph III (b)(1) of the Georgia constitution, which says: No county may exercise any of the powers listed in subparagraph (a) of this Paragraph [including police protection] or provide any service listed therein inside the boundaries of any municipality or any other county except by contract with the municipality or county affected. What many people miss is the clause right before that: "Unless otherwise provided by law." Georgia courts have held that the law does provide otherwise when pursuing someone for a traffic offense: The plaintiff contends that when the collision occurred, the policeman-deputy sheriff had no authority to be pursuing the Mitchell car because he was outside the county in which he had a power of arrest. While ordinarily a peace officer has power of arrest only in the territory of the governmental unit by which he was appointed, there are two exceptions to the rule present in this case. Code Ann. s 92A-509, which deals with arrests for traffic offenses, provides by implication that certain officers (including deputy sheriffs) have arrest powers for these offenses outside their appointed territories. City of Winterville v. Strickland, 127 Ga. App. 716, 718, 194 S.E.2d 623, 625 (1972). What that case decided in 1972, the principle was in place well before the boys began their hijinks. I don't know of any state where the law is different, though the answer would be different if the boys crossed into another state.
In general, yes, police could do this. I am not aware of any US state or locality which requires an officer to execute a stop as soon as a traffic violation is observed. Whether the police would act in such a way is another question, but in some areas maximizing citation revenue is a high priority, so police in such areas might act in such a way. If police think a person's actions are &quot;suspicious&quot; and think that the person might be involved in some crime more serious than a traffic violation, it would be common procedure to follow without making a stop or arrest to get a better idea of what the person was doing. Many police I have encountered seem seriously concerned to stop someone driving in what they consider an unsafe way as quickly as possible, and so stop violators promptly, but I don't say that motivates all police all the time.
"Public space" is not a relevant criteria when considering trespass or other crimes/torts against property. The relevant criteria is who owns it and what they allow you to do on it. All land in the USA is owned by someone. That someone may be a government; that does not make it a public space - Camp David is owned by the US government; it is certainly not public. The owner of the land can decide (subject to the law) who has access to their land and in what circumstances. If they erect a fence then they are saying "You cannot access my land here" - if you ignore this then you are trespassing. This is true even if there are legitimate ways to access the land i.e. there is a place where there isn't a fence; to avoid trespass you would have to access the land from there. If you think of this in terms of a public building like a courthouse you are free to enter through the unlocked front doors but not by climbing through a window. The trespass is in the act of crossing the fence - that is the act that you have been implicitly denied permission to do. Being on one side or the other is not trespass. For the specific image that you show it is quite likely that those roads are owned by different people - the highway is probably owned by the state while the cul-de-sac is a local government road.
You were trespassing The community college is a public institution but they can decide what part of their land you can walk on and in what circumstances. Just like the military is a public institution but they don’t let you walk across their shooting ranges. To be clear, in the absence of clear “no dogs allowed” signage, you were not trespassing until you were told about the policy. At that point, you were legally obliged to remove yourself (or more precisely, your dog) from the campus as soon as possible. When you refused to do so, you became a trespasser. It’s trivially easy to find out who you are. One photograph, one reverse image search they’ll know everything about you right down to your shoe size. Even if you don’t use social media, I’m sure some of your family and friends do. In most US states, trespass is a misdemeanour and also in most states members of the public can arrest someone who is committing a misdemeanour in their presence. They can use reasonable force to do so and can hold the arrestee until they can transfer them to the custody of a law enforcement officer. Admittedly, this seems unlikely but it is possible. If you have caused damage, you can be sued. It seems that your discussion with the college staff was somewhat protected so the loss of productivity of those staff members is a loss that the college suffered and that they could sue you for. Again, not likely but possible. Alternatively, they could just report you to the police who may or may not bring charges. Note: this assumes the dog is a pet. If it’s a disability assistance animal, it can’t be excluded. See: Are sidewalks on a university public or private property? Can a local government charge a fee to enter a public downtown area during an event? Trespassing or Public Property? Is a mall considered a &quot;public place&quot; for copyright purposes?
You cannot booby trap your property, see Can I booby-trap my property against police? You can, however, protect your property in any reasonable way that will not cause harm to innocent trespassers. So things like fences with obvious barbed wire, road spikes that would damage tires but not people etc. From the images it seems like the nature of the spikes are such that they would injure someone who stepped on or fell on them and probably cross the line into booby trap territory.
No For the same reason that requiring a licence to drive might, in some circumstances, result in harm to a person who cannot drive because they don’t have a licence. The city (or any government) has legislative immunity for the laws they put in place even if those laws have negative consequences to some people. All laws have negative consequences to some people, for example, laws against theft are extremely prejudicial to thieves. Similarly, the executive is immune for exercising their discretion in the enforcement of the law. This is the basis of the police not having a general duty to protect. However, police have a specific duty to protect when they have taken an individual into their care and control.