Across the United States, cadaver dogs are used in a variety of crime investigations, ranging from missing persons cases to murder.

In a murder that shocked New York City in December 2010, Sylvie Cachay, a rising swimwear designer, was murdered at a members-only club by her unemployed boyfriend.

Snakes, rats, dogs and pigs—some killers weaponize animals to pull off their heinous crimes.

Sgt. Leverett talks to A&E True Crime about how he gets people to tell the truth, the unexpected places he's found drugs (butts aren't that unusual) and what would surprise fans to know about his K-9 partner Flex.

Deb Davis of Paws With a Cause, a group that works with six Michigan Department of Corrections facilities to train service and assistance dogs, talks to us about how inmates train the dogs and what inmates and prisons get out of their program.

We asked Live PD's Officer Alyssa Wright how it feels to be called a role model, working with her K-9 partner Cairo, and what you didn't see happen during that intense take down featured on a recent episode.

Watch highlights from Live PD featuring fan favorite moments featuring the show's courageous canines.

Some of the dog breeds that serve and protect in law enforcement agencies around the world.

A timeline of dedicated (and sometimes deputized) dogs.