CLEAN: Batman suspect's home was booby-trapped 'to kill cops'

The transcript discusses a crime scene involving a sophisticated device, likely entered by a police officer. The device's complexity is under expert review, and while the threat is reduced, it remains. Bomb technicians are handling potential explosives, and the environment is dangerous for civilians and first responders. A thorough search has confirmed no further hazards.

What could have happened if an unassuming pedestrian or first responder entered the crime scene?

What actions were taken to ensure the safety of the crime scene?