What defines a custodial arrest?

A custodial arrest is characterized by the process in which a suspect is taken into police custody and typically transported to a jail or similar facility. This type of arrest signifies that law enforcement has taken formal control over the individual, often following the apprehension for criminal activity. The key element of a custodial arrest is that the individual is not free to leave; instead, they are in the custody of law enforcement officers, which may involve booking processes and potential charges.

In contrast, the other options describe different scenarios that do not align with the definition of a custodial arrest. For instance, a scenario where a suspect is fined and released on the scene indicates a non-custodial situation where the individual retains their freedom. The option mentioning immediate transportation to a hospital refers more to an emergency medical situation rather than a formal arrest. Lastly, the option that describes an interview on-site suggests a situation where the individual may not have been arrested at all, as they could be voluntarily providing information without being detained.