Is there protocol for US police officers for handling a fellow cop that is using excessive force? If I'm a police officer in the United States and my partner is restraining a suspect with an excessive or otherwise out-of-protocol use of force, what am I legally allowed to do to stop him?
As mentioned in a comment by @Dancrumb, the exact policies of each local police department will be different, and there are thousands of them. There is a relevant requirement at the Federal level according the Department of Justice, but it is not clear to me to what extent this applies to peers and not just supervisors: An officer who purposefully allows a fellow officer to violate a victim's Constitutional rights may be prosecuted for failure to intervene to stop the Constitutional violation. To prosecute such an officer, the government must show that the defendant officer was aware of the Constitutional violation, had an opportunity to intervene, and chose not to do so. This charge is often appropriate for supervisory officers who observe uses of excessive force without stopping them, or who actively encourage uses of excessive force but do not directly participate in them.
There is pretty much never a right to retaliate against harm to oneself, even blatantly unlawful harm. There is a right to defend oneself and others. One can use force to stop someone from inflicting unlawful or unjustified harm, or to prevent someone from inflicting such harm when the harm is imminent. One is not permitted to use more force than is "reasonably required" under the actual circumstances. This is true in pretty much every jurisdiction that i know of. The details on how much force will be considered "reasonable" will vary. In some jurisdictions there is, under some circumstances, a s"duty to retreat". This generally means that if a person attacked can avoid the harm by fleeing with reasonable safety, that person must do so rather than using force in self-defense. In some jurisdictions this "duty to retreat" applies id the victim is attacked in public, but not in the victim's own home. The right to self defense does not apply when the "attacker" is an agent of the state acting lawfully. For example, a prison guard taking a condemned prisoner to a death sentence cannot be attacked on the grounds that the prisoner is engaging in self defense. In theory a police officer engaging an excessive force, particularly unjustified deadly force, may be resisted in self-defense. But courts are quite reluctant to find such resistance justified in practice. There generally must be very clear evidence of egregious misconduct for the court to rule for the non-police person in such a case. Note that "self" defense can equally be defense of another person. Pretty much all the same rules apply. Self defense applies no matter who the attacker is, but that force is reasonable may vary depending on the attacker. Only such force as is reasonably required to stop or prevent the harm may be used with a justification of self-defense.
england-and-wales Initially, one should comply with the officer's instructions as he has the power under statutory Stop &amp; Search powers to detain someone for the purpose of the search (discussed here). Failure to do so may be an offence. If, subsequently, one considers the search and detention was unlawful, the first port of call is to lodge a complaint with the relevant police force who - depending on the circumstances - may escalate the complaint to the Independent Office for Police Conduct IOPC. You can complain directly to the police/other organisation (see ‘Who can I complain about?’ below for a list of the other organisations) or via the IOPC. If you complain via the IOPC, your complaint will be sent direct to the organisation involved. They will assess your complaint and contact you about how it will be handled. The IOPC will not be involved with this initial assessment of your complaint. If the complaint is found to be valid, then any offence committed by not complying with the office would (in all probability) be overturned on appeal. As well as any compensation awarded by the court, the Chief Constable may consider making an ex gratia payment (mentioned here). Note that there is no obligation to do anything if the interaction falls within the Stop &amp; Account provisions.
You acted illegally in assaulting your fellow student. When you are in public, a person can legally take your picture, and you are not allowed to assault a person because you do not like their legal actions. Any degree of force is excessive except in certain responses to illegal fource, and even the threat of force is excessive. You also have no right to demand that a person prove that they didn't take your picture, and certainly no right to enforce that demand with physical violence.
It is premature to judge the particular case because the facts are not all available. But we can address the general principles. The Model Penal Code 3.04(2)(a) sets out the general principles clearly. A person has the right to self-defense against unlawful force. But, the use of force is not justifiable to resist an arrest which the actor knows is being made by a peace officer, although the arrest is unlawful. But more specifically under (b) The use of deadly force is not justifiable under this Section unless the actor believes that such force is necessary to protect himself against death, serious bodily harm, kidnapping or sexual intercourse compelled by force or threat However, there is a further condition that force is not justifiable if the actor knows that he can avoid the necessity of using such force with complete safety by retreating or by surrendering possession of a thing to a person asserting a claim of right thereto or by complying with a demand that he abstain from any action which he has no duty to take Then finally, §3.05 says that this goes for people using force in defense of others. The short version is that the common law right to resist illegal arrest has been supplanted by a statutory requirement to submit to police authority, for example in California and New York. In Ewumi v. Georgia, defendant was illegally arrested and physically defended himself, which resulted in a battery charge and conviction. The battery charge was overturned because the arrest was illegal ab initio. If one resisting an authorized arrest, where an officer's force is likely to result in unjustifiable great bodily harm, the question is whether a reasonable person would find it necessary to resist in self-defense. It is unusual for the courts to find that to be the case. Minnesota law says that reasonable force may be used upon or toward the person of another without the other's consent when the following circumstances exist or the actor reasonably believes them to exist: (1) when used by a public officer or one assisting a public officer under the public officer's direction: (a) in effecting a lawful arrest Other sections say that a person who is not a public officer may use force to effect an arrest, or, "(3) when used by any person in resisting or aiding another to resist an offense against the person". Being arrested by the police is not an offense, and none of the other justifications for use of force apply.
TV shows like COPS will have the arrestees/suspects/bystanders/victims sign a waiver to appear on the show, along with anybody else that they film in the process, otherwise the faces will be blurred, or removed from the show entirely. Additionally you can tell the camera crews that they are not allowed in your home. If they do enter your home without permission, you can sue them for trespassing. It should be noted that those shows are often edited for drama, and as such seem much more dramatic than it is. The film crews may spend weeks or more (400 hours of video) just to get enough "good stuff" for a 22 minute episode, and then make it look like it all happens over the course of an evening. As for the moral/social acceptance of a lack of privacy, that question really isn't on-topic here. This should be the same for any other "COPS-like" TV/youtube show, but there are some shows out there that don't take the rules as seriously as others. Those usually operate under the "who we are filming probably can't afford a lawyer" mentality so they keep going until they get sued.
Self-defence has nothing to do with whether you are performing an arrest (lawful or otherwise) Self-defence is a plea that you used reasonable force to protect yourself, others and in some jurisdictions, property, from immediate harm. There is, as you say, a “whole spectrum” of both the perception of the threat and the force used that go into determining if the actions of the defendant amounted to self-defence or not. That’s why it’s up to the jury to decide on a case by case basis. A person who has the power of arrest (law enforcement officers and citizens who actually witness a crime) is authorised to use reasonable force to effect that arrest. Of course, effecting an arrest may cause a situation to escalate to the point where self-defence becomes an issue.
Anyone can be arrested, as long as the police (and in some cases, anyone) have probable cause to do so. This generally includes two points: You are in the process of committing a criminal act The police have probable cause, generally through evidence, that you are in the process of, about to, or have committed a criminal act. This usually requires obtaining a warrant for the arrest. However, it's important not to conflate searches with arrest. Arrests are when you are being taken into custody for the reasons mentioned above. Searches are when your personal belongings (i.e. property), are searched to collect evidence. It is not up to police to convict someone. This is the job of the judicial system. There's a bit of terminology here: convictions basically mean being found guilty of an offence. Police don't have the ability to convict someone of an offence. They do have the ability to arrest, and charge with an offence. To charge someone with a crime basically means to accuse them of having done something. Now let's get to the actual crime. Since you haven't mentioned a specific jurisdiction, I'm going to use Canadian cases and law, but in general, it should apply worldwide. If the police have reason to believe that you are engaging in unlawful hacking-related behaviour, then they have the authority to arrest you. They simply need to have a reasonable belief that you are engaged in the crime. Something such as connecting you with an IP address and connecting that you were online at the time is enough. If the police need to find out more information (which they generally do, to investigate further into the matter) - they can obtain a search warrant afterwards. With this, they can legally search into your computer, and investigate. Any evidence that they collect can be used in court. I've recently done some research into cyber crimes. One rather infamous case involved the attack on multiple large scale websites, including Dell, Yahoo, and Amazon, in 2000. This sparked a large scale investigations, between the RCMP (Royal Canadian Mounted Police) and the FBI. The attacks were claimed by some to cause nearly 1.7 billion dollars of damage. The hacker was charged with 58 different offences. You can imply from the linked article that he was arrested before his computer was searched.