We have an area where the usual collection of personal devices (cell phones, smartwatches, etc.) are prohibited, but with people being people and everyone being pulled 5 different directions mistakes happen and someone will find themselves with something somewhere it’s not supposed to be. Does anyone sell a device that can be placed at a perimeter door and alert when some device capable of wireless communication via wifi, bluetooth, NFC, etc. within range that shouldn’t be there? Even better, does anyone have direct experience with such a thing and can suggest how to evaluate a product like that or suggest a vendor to investigate?