Highly experimental device to remotely defeat those small handheld metal detectors used by schools, offices, rent-a-cops, etc.
Metal detectors work by generating a RF signal around 95 kHz through a tuned circuit. When brought near any metallic object, the frequency increases or decreases (depending on if it's ferrous or not). This "change" in frequency sets off the metal detector's alarm.
Cheaper, hand-held type metal detectors a susceptible to remote, covert (i.e. not on your person - the jammer would set off the metal detector) RF jamming of the metal detector's sense signal. More advanced metal detectors are frequency agile and contain built-in interference detection mechanisms.
Schematics
- none yet
Sneaking Weapons Past Metal Detectors
From time-to-time GBPPR Directorate of Operations officers will need to pass weapons through a conventional metal detecting search. Here are some ideas for improvised weapons which should pass a normal inspection.
- CD Media - When broken, the sharp edges of a compact disk (CD) can be used as a stabbing weapon. Aim for throat or neck area.
- IR Laser - Replace the laser diode in a conventional laser pointer with a high power (120 mW+) infrared laser diode. Point at the eyes of the enemy, and burn their retinas.
- Steel Wool - Fine, single, threads of steel wool can be used as a fuse for starting fires. When connected to a battery, steel wool threads will glow red hot.
- Ni-Cad Batteries - A feature of common Ni-Cad rechargable batteries is the fact they are capable of high output currents. You can short them out with wire to start small fires.
- Fishing Line - High poundage, non-metallic fishing line can be used for cutting or choking a victim.
Notes
- Garrett Metal Detectors
- FBI Guide to Concealable Weapons 2003 Shows various types of knives and what they look like to an X-ray machine (2.3 M PDF)