<P> For a dog to be considered for a Police Department, they must first pass a basic obedience training course . They must be able to obey the commands of their handler without hesitation . This allows the officer to have complete control over how much force the dog should use against a suspect . Dogs trained in Europe are usually given commands in the country's native language . Dogs are initially trained with this language for basic behavior, so, it is easier for the officer to learn new words / commands, rather than retraining the dog to new commands . This is contrary to the popular belief that Police Dogs are trained in a different language so that a suspect cannot command the dog against the officer . </P> <P> Dogs used in law enforcement are trained to either be "single purpose" or "dual purpose". Single purpose dogs are used primarily for backup, personal protection, and tracking . Dual purpose dogs, however, are more commonly trained . Dual purpose dogs do everything that single purpose dogs do, and also detect either explosives or narcotics, however, they cannot be trained to detect both . Dogs can only be trained for one or the other because the dog cannot communicate to the officer if it found explosives or narcotics . When a narcotics dog in the United States indicates to the officer that it found something, the officer has reasonable suspicion to search whatever the dog alerted on (i.e. bag or vehicle) without a warrant . </P> <Ul> <Li> Sentry and attack K9s - This dog is used to locate and subdue suspects or enemies, and to provide security for sensitive or controlled areas . </Li> <Li> Search and rescue K9s (SAR) - This dog is used to locate suspects or find missing people or objects . Bloodhounds are often used for this task . </Li> <Li> Detection or explosive K9s - Some dogs are used to detect illicit substances such as drugs or explosives which may be carried on a person or in their effects . </Li> <Li> Arson K9s </Li> </Ul> <Li> Sentry and attack K9s - This dog is used to locate and subdue suspects or enemies, and to provide security for sensitive or controlled areas . </Li>

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