MS-13 is not only terrorizing Long Island's village of Patchogue, but has Latinos who live and work there fearful that the gang's presence will contribute to widespread anti-Latino hostility.

Sgt James Hager of the Monroe County Sheriff's Office talks about the challenges of processing a crime scene under water and how procedures for handling violent crimes at sea differ from handling them on land.

How sound is the reasoning that a refusal to take a polygraph test is a sign of guilt? We speak to former polygrapher and current anti-polygraph activist, Douglas Williams, about what he sees as the test's fundamental problems.

Retired Detective Sergeant Joseph Giacalone had the pleasure of working with compassionate cops who truly loved the job and "cowboys" who were unworthy of the badge. Here are some of his stories.

Since being approached by an officer can inspire feelings ranging from confusion to panic, we asked Live PD analyst Tom Morris Jr. for some tips on how best to behave—and communicate—during a brush with police.

If you've ever been crammed into a bus without air conditioning in the summer, you're probably familiar with how easily tempers can flare in hot weather. And there's no shortage of experts trying to explain this phenomenon.

Michael J. Tillman says 20 years in the crime-scene cleanup field have taught him how to walk the line between sensitive, personal care for a victim's family and maintaining a sense of remove so he can still come to work the next day.

Live PD's Sgt. 'Sticks' reveals his favorite police movies.

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

A timeline of dedicated (and sometimes deputized) dogs.