While I see the utility of something like this for some instances, I do not like the idea of the every day joe being able to detect a firearm from 40 feet away. Imagine the ruckus that could ensue.
https://www.usatoday.com/story/tech...07/phone-case-bomb-scanning-device/678075002/
https://www.usatoday.com/story/tech...07/phone-case-bomb-scanning-device/678075002/