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Detection dog training in U.S. Navy military for drug detection An English Springer Spaniel on duty as a detection dog with the British Transport Police at Waterloo Station A detection dog or sniffer dog is a dog that is trained to use its senses to detect substances such as explosives, illegal drugs, wildlife scat, currency, blood, and contraband electronics such as illicit mobile phones. [1] The sense most used by detection dogs is smell. Hunting dogs that search for game, and search dogs that work to find missing humans are generally not considered detection dogs. There is some overlap, as in the case of cadaver dogs, trained to search for human remains. A police dog is essentially a detection dog that is used as a resource for police in specific scenarios such as conducting drug raids, finding missing criminals, and locating stashed currency. Frequently, detection dogs are thought to be used for law enforcement purposes; however, they are also used as a valuable

索倫 ，可以指： 索倫 (魔戒)：《魔戒》人物 梭伦（Solon）：古希臘政治家 索伦部：清朝索伦部落 索倫 (德國)：德國萊茵蘭-普法爾茨州的一個市鎮 索倫，貓頭鷹守護神主角，參閱貓頭鷹守護神-角色 索伦县：中国旧县名，在今内蒙古自治区境 这是一个消歧义页，羅列了有相同或相近的标题，但內容不同的条目。 如果您是通过某條目的内部链接而转到本页，希望您能協助修正该處的内部链接，將它指向正确的条目。 This page is only for reference, If you need detailed information, please check here

U.S. Army soldiers use a metal detector in 2002. A metal detector is an electronic instrument which detects the presence of metal nearby. Metal detectors are useful for finding metal inclusions hidden within objects, or metal objects buried underground. They often consist of a handheld unit with a sensor probe which can be swept over the ground or other objects. If the sensor comes near a piece of metal this is indicated by a changing tone in earphones, or a needle moving on an indicator. Usually the device gives some indication of distance; the closer the metal is, the higher the tone in the earphone or the higher the needle goes. Another common type are stationary "walk through" metal detectors used for security screening at access points in prisons, courthouses, and airports to detect concealed metal weapons on a person's body. The simplest form of a metal detector consists of an oscillator producing an alternating current that passes through a coil producing