Are homeless people natures speed bumps?
Heat sensors, to detect heat from humans.
You can helicoil new threads and put in new stud or tap it out for an oversized stud and replace dealer should have it
If you have never been trained on how to use an extinguisher, then don't. Sound the alarm and get out.
An array of different sensors, Including but not limmited to motion detectors, infrared heat detectors, real time Videio magnetic feild detection, gas sampling. Just think of the probes on Star Trek
