Arrest or custodial arrest is the process in which the police take physical possession or custody of a person whom they have probable cause to believe committed a criminal offense. Arrest is distinguishable from other circumstances in which the police stop, detain, or otherwise interact with persons because it is generally the point at which a person is not free to leave or walk away from the police. Arrest is also the point at which some Constitutional rights and protections are provided to the accused. A person who is placed in handcuffs or otherwise physically restrained is clearly under arrest—but in some circumstances a person may be under arrest due to threats or intimidation from the police.

In Alaska, an arrest or custodial arrest occurs when law enforcement takes physical custody of an individual based on probable cause that the person has committed a criminal offense. This is a more severe action than a mere stop or detention, as it typically means the individual is not free to leave the presence of the police. The use of handcuffs or other physical restraints is a clear indication of an arrest, but an arrest can also occur if the police use threats or intimidation to detain a person. Once arrested, individuals are afforded certain Constitutional rights, such as the right to remain silent and the right to an attorney. These rights are designed to protect the accused during the criminal justice process. It's important to note that state statutes and federal law, including the Fourth Amendment to the U.S. Constitution, govern the process and legality of arrests to ensure that individuals' rights are upheld.