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For what are police dogs used?

Police dogs have a highly developed sense of smell. They can track down suspects and detect the presence of drugs and other substances at the crime scene. They are also invaluable in rescue work.

Is real detective work almost the same as on TV?

Some things you see on TV are quite similar to actual police work. Police officers often use firearms and physical strength on TV. However, the use of a firearm or physical strength is in all probability the most serious act in which a law enforcement officer will engage.
In a TV drama, criminals are soon caught and the case solved, but in reality it takes a lot of unrelenting patience and perseverance.