What must occur when a suspect is being held after the 12-hour limit?

In situations where a suspect is being held beyond the legally established 12-hour limit, it is imperative that supervisor approval is obtained. This is a critical step to ensure that authorities are acting within legal boundaries and maintaining accountability in the detention process. By requiring a supervisor's approval, the procedure adheres to policy guidelines that are designed to protect the rights of individuals and prevent unlawful detention.

Additionally, obtaining supervisor approval allows for a review of the circumstances surrounding the detention, ensuring that there is justifiable reason to continue holding the suspect. This process helps maintain proper oversight and ensures that law enforcement actions are in alignment with legal and ethical standards.

The other choices do not align with proper protocol. A simple determination to detain longer without authorization or the additional requirement for a warrant does not automatically follow the initial detention period unless validated by a supervisor. Releasing the suspect immediately could also violate necessary protocols if there is still a valid reason for their detention, especially if it is justified under the circumstances of the case. Therefore, supervisor approval serves as a necessary checkpoint in the process of law enforcement.