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Bank tellers have several of these packs near their station at all times. A pack is put in safe mode by attaching it to a special magnetic plate. During a robbery, a teller tries to slip one of the dye packs into the money bag without the thief noticing. While the thief is still inside the bank, the dye pack remains dormant. Within the dye ckage is a small radio receiver that is activated when the pack is removed from the magnetic plate. A small radio transmitter is mounted inside or near the door frame of all entrances of the bank. Once the dye pack passes through the door and receives the specific radio frequency signal, it activates. The dye pack is usually set on a timer of 10 seconds or longer so that the criminal is either in his getaway car or running a good distance from the bank before the package explodes.When the dye pack explodes, it releases an aerosol of red smoke, red dye

 

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