Allow for temporary door locks during emergency situations

This bill allows public buildings in Montana to use temporary door locking devices during shelter-in-place or emergency lockdown situations, creating a limited exception to existing fire code rules. The devices must meet specific safety requirements, such as being removable without a key from the exit side, not modifying fire-rated hardware, and being approved by local fire or law enforcement officials. It amends state law to clarify that obstructing fire exits is unlawful except when these approved temporary locks are used during emergencies. The bill takes effect immediately upon passage and requires that the devices be integrated into building safety plans and staff training programs.