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standoff distance
Standoff distance is a security measure that focuses on preventing unscreened people and vehicles from approaching within a certain distance of a building, car, or other shelter where a violent criminal is sheltered, hostages are under armed threat from kidnappers, where a bomb is believed to have been placed, or where other unspecified dangers may be lurking. It is a measure of distance informally used by agents handling the situation to protect their own persons from physical injury or death while the situation is resolved.
==Firearms==
When an armed and violent criminal is sheltered in a location not easily reachable by a tranquilizer round or disabling shot - or extreme prejudice ammunition, if authorized by mission leaders - police, military, and counterterrorism officers maintain distance (often out of the direct line of sight and behind cover) while often using a megaphone to call for backup, the arrest of the subject, or to talk him/her into custody. Sniper coverage is used often in these situations, and standard procedure for officers or operatives (or citizens taking part in a citizen's arrest) is to call for heavily armored backup while maintaining cover themselves. Therapeutic or diplomatic techniques may be used to talk down the suspects or identified threats and assailants.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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