From:	Schnood <cdjworks@******.DIGEX.NET>
Subject:	Re: anti-bullet barrier
Date:	Tue, 8 Mar 1994 21:43:09 -0500

>Airport metal detectors are magnetic anomality detectors (MAD), which means
>they will only tag metals that can be magnetized, so they don't pick up
>lead. They will pick up steel, the primary material used in firearms
>design.

Er, not quite. Airport metal detectors (and all walk-through metal
detectors to my knowledge) work by generating an RF field pulse then
detecting the return from the metal within the field. What happens is
the pulse radiates the metal, and when it cuts off the metal continues to
radiate for a little while. MAD only works for very large pieces of
metal, and its a detector only.

---
Dawn: The time when men of reason go to bed.