Drug detection dogs, after professional training, can perform search tasks according to the instructions of the trainer. They are mainly used to search for different search objects (people, objects, etc.) in different places, venues, and spaces to discover illegal concealments. of drugs.

They work by relying on their two major advantages: sensitivity to odors and the ability to identify odors. They can sniff out numerous packages or luggage. Packages containing drugs such as marijuana, heroin, cocaine, etc. can eliminate the disguise and smell interference of drug dealers on drug packaging, identify the smell of drugs among various mixed smells, and accurately find the hiding place of drugs, so it is called "drug sensing" device".