Which code covers lock in / lock out?

• A. Mailbox Fire
• B. Missing Person
• C. Lock In / Lock Out
• D. Hazmat - Mercury Spill

Answer: (C)

Lock in / lock out is used for situations where access to a building or area is blocked by locked doors, meaning occupants are trapped inside or locked out and need assistance to gain entry or exit. The term directly describes the scenario, so it clearly communicates the required type of response and resources.

This matches the incident type that involves access problems rather than other unrelated events. A mailbox fire describes a small fire in a mailbox, a missing person involves locating someone, and a hazmat mercury spill involves dangerous materials handling and containment. None of those describe doors being locked or access being blocked, which is why they aren’t the appropriate code.