Editing Vigelantism (section)

===Legal possibility===
In the United States, all states permit citizen arrests if a felony crime is witnessed by the citizen carrying out the arrest, or when a citizen is asked to help apprehend a suspect by the police. The application of state laws varies widely with respect to misdemeanor crimes, breaches of the peace, and felonies not witnessed by the arresting party.  In California, for example, there is no requirement that a lawful arrest be executed by a citizen (as opposed to an alien (law)|alien or illegal immigrant), and the citizen's arrest is referred to as a "private person arrest."  Note particularly that American citizens do not have the authorities or the legal protections of the police, and are liable before both the civil law and criminal law for any violation of the rights of another.

Other countries, such as Canada and Sweden allow citizen's arrests under certain circumstances. General provisions tend to be that the crime has to be serious and the arrestee has to be caught ''in flagrante delicto'' (in the act of committing the crime). As an example, France allows any person to arrest a person having committed ''in flagrante delicto'' a crime punishable by a jail or prison term, and to conduct that person before the nearest officer of judiciary police &ndash; in practice, nowadays, one would rather call the police in after performing the arrest ([http://admi.net/cgi-bin/adminet/article.pl?c=CPROCPEL&a=L73 Code of penal procedure, L73]).

In New Zealand, citizen's arrests can be made if the crime is being committed at night, is punishable by three or more years of imprisonment, and the person is attempting to escape from the person making the arrest. The person making the arrest must also inform the suspect the reason he or she is being arrested and take him or her to the nearest police officer.

In the Australian state of South Australia any person may arrest a person guilty of a breach of the Criminal Law Consolidated Act. They must make it clear they are arresting the person by words or actions.

In Germany, citizen's arrests can be made under [http://dejure.org/gesetze/StPO/127.html §127 StPO (code of penal procedures)] if the arrestee is caught ''List of Latin phrases#I|in flagrante delicto'' and the identity of the person cannot be (otherwise) established immediately. The person making the arrest is allowed to hold the arrestee solely for the purpose of turning him over to a proper legal authority such as the police. German law does not establish that the crime has to be serious, nor that the person making the arrest has to actually be a citizen of Germany. 

In England and Wales, a citizen's arrest is allowed under the [[Police and Criminal Evidence Act 1984]] for an arrestable offence in two circumstances: Firstly, any person who knows that an arrestable offence has been committed may arrest a person who they have reasonable grounds for suspecting committed that offence; and secondly, any person who has reasonable grounds for suspecting that another person is in the process of committing an arrestable offence may arrest that person.
The first of these powers is rather risky to use, since it relies upon the person carrying out the arrest ''knowing'' that an arrestable offence has been committed — if, for example, the person they arrest is later acquitted in court, then no offence has been committed, and so the arrest was false arrest|unlawful.
In addition to the above, a private person may be authorised to execute an arrest warrant, if the court issuing the warrant has given them the authority to do so, and any person may arrest someone who is "unlawfully at large" (for example, an escaped prisoner).[http://www.kevinboone.com/citizens_arrest.html]

Despite the title, the arresting person does not necessarily have to be a citizen of the country where he/she is acting.