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A tripwire is a passive triggering mechanism. Typically, a wire or cord is attached to some device for detecting or reacting to physical movement.

A tripwire may be a wire attached to one or more mines — normally bounding mines and the fragmentation type — in order to increase their activation area.[citation needed]. Alternatively, tripwires are frequently used in boobytraps, whereby a tug on the wire (or release of tension on it) will detonate the explosives.

Soldiers sometimes detect the presence of tripwires by spraying the area with Silly String. It will settle to the ground in areas where there are no wires; if there are any, the string will be suspended in the air but not set them off due to its light weight. It is being used by U.S. troops in Iraq for this purpose.[1][2][3]

[2012,2013] New technologies have been recently deployed to detect tripwires. Green laser line generators are now used to illuminate & detect trip & command wires. The bright laser line creates a fluorescence that can be seen by the bomb tech. Z-Bolt C-TRIP-10G Green Dot & Line Laser Now in use by Navy EOD [in the Afghan theater], FBI, DEA, Municipal & State Police Bomb Squads and Hazardous Device Teams.

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