What type of count occurs at each shift change and may occur between lock-in and open-up periods?

The type of count that occurs at each shift change and may take place between lock-in and open-up periods is known as a regular count. This procedure is essential in detention settings as it helps ensure accountability for each inmate and maintains security within the facility. A regular count typically involves verifying the presence and identity of all individuals being detained, allowing staff to promptly identify any discrepancies, such as missing persons or unauthorized absences, which are critical for maintaining order and safety.

In the context of shift changes, conducting a regular count provides the incoming shift with a precise understanding of the current population status, essential for effective operational hand-offs. The other types of counts mentioned may occur under specific circumstances but are not performed regularly at shift changes, making regular counts the standard procedure for ongoing population management in detention environments.