Here's a group of canine cops you don't want to mess with.

Police dogs from across the country flocked to Lakeland, Fla., this week for the United States Police Canine Association's detector dog trials. With the help of their human handlers, the dogs — mostly German Shepherds and Belgian Malinois — test their ability to sniff out drugs, arson materials, bodies, wild game and explosives, according to the Associated Press.

The dogs are already certified regionally, but the three-day event gives them a chance to be recognized by a national organization, which lends more credibility when their police departments present evidence in a criminal trial. Plus, the detection work is mentally stimulating for the dogs, many of whom live with their handlers.

Check out this video of Shea, a 6-year-old German Shepherd, sniffing cars during one of the trials. For more information about the event, visit the Associated Press article.