Will aluminum foil go off in a metal detector?
The answer is Not Always. It depends on how much aluminum foil and also on the configuration of the aluminum foil (i.e. balled or flat). Most metal detectors operate by having two receivers with a central transmitter that both generates an electromagnetic field and broadcasts a radio frequency. Anything that enters into this field that is either Magnetic or Electrically Conductive will cause a disturbance in one or both of the field strengths. All metals will show one of these characteristics. However, aluminum foil can sometimes pass through, like in product packaging with aluminum foil lids and trays. But, please know that there are also Foil Detectors, that some places use, too.
