3 ways an elevator controller can save the lives of people

It so often happens that during an emergency, elevators shut down completely, forcing many helpless people (read, the elderly, children and physically handicapped people) to be stuck and give up to the ruthless force of destiny. Hospitals and buildings especially have faced such problems and maybe a breakthrough is what the world really needs now.
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This is safety, scientifically!

Metal detectors are used to ensure security at crowded public places. The most obvious benefit of placing metal detectors at public places is the immediate detection of weapons from the visitors entering the area. Detection of any sort of weapons could be a proactive step to prevent any tragic incident that is probable to happen within the region.
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