What legal principle does the term "custodial interrogation" primarily involve?

The term "custodial interrogation" primarily involves the principle that a suspect is subjected to questioning after having been deprived of their freedom of movement in a significant way. This situation typically arises when an individual is formally arrested or otherwise not free to leave due to police actions. The legal importance of this concept stems from the need to protect a suspect's Fifth Amendment rights against self-incrimination, which necessitate that law enforcement officers inform the individual of their rights, such as the right to remain silent and the right to an attorney, prior to any questioning.

In context, when a suspect is in custody and being interrogated, it implicates the necessity for the Miranda warning to be delivered, as failure to do so could result in any statements made during the interrogation being inadmissible in court. Thus, understanding "custodial interrogation" is crucial for law enforcement professionals to ensure that the rights of suspects are safeguarded while still performing their duty to investigate crimes.