Which statement describes the primary purpose of the transport security measure described in 9.21(D)(4)?

• A. A security screen (cage) in transport vehicles.
• B. An interior microphone system.
• C. External alarm system only.
• D. First aid kit.

Answer: (A)

The main concept is using a physical barrier inside transport vehicles to separate detainees from officers. A security screen creates a tangible boundary that prevents detainees from reaching the officer or driver, reduces the risk of assaults, tampering, or escapes during transport, and allows the officer to monitor and control the situation safely. This makes it the most direct and effective means of maintaining security during transport.

An interior microphone system, while useful for communication or recording, does not prevent threats or provide the necessary physical separation. An external alarm system by itself addresses perimeter alerts but again doesn’t create the internal barrier needed for custody and control. A first aid kit is essential for medical readiness but does not contribute to preventing escapes or maintaining security during transport.