On Wed, 20 Apr 2016 17:52:05 -0400, Ralph Mowery
wrote:

In article ,
says...


Some types of anti static bag defeat the security tag detectors in shop
doorways.

The motivation behind making them so readily available is anyone's guess.


Yesterday I had to go through a metal detector to get into the court
house. Even had to remove my belt so the buckle would not set it off.

Got me to thinking that iron and steel effect radio tuned circuits one
way and brass and maybe some other materials affect it the other way.

Could someone have say a knife with a steel blade and an matching amount
of brass go through the detector with out setting it off ?



I don't know if your scheme would work but I do know that airport
metal detectors have some way to discriminate between a key in my
wallet and all the titanium and stainless steel in my arms, back, and
pelvis. I used to set the things off but not any more. I have spoken
with folks who have long pins in their legs, artificial knees, and
artificial hips and they don't set off the airport metal detectors
either.
Eric