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First of all, what is a lie detector? It’s also known as a polygraph test. In movies and TV shows, it is used to decide if a suspect is innocent or guilty. But it’s not quite that simple. Recommended ...

Retired Master Police Officer Joseph Gribble reminds us that a polygraph test won't tell the whole story but can capture those additional details needed to make or break a case.

A version of this story appeared in the On Background newsletter from The Washington Times. Click here to receive On Background delivered directly to your inbox each Friday. The Drug Enforcement ...