George Olivo, a retired FBI special agent and senior polygraph examiner, on how polygraph tests work and their reliability.

Posthumous DNA testing proved what Roger Keith Coleman repeatedly denied—that the Virginia man raped and murdered his sister-in-law in 1981.

After Candra Torres's husband was murdered by a man they had just met, she corroborated the stranger's story that it was an accident. But days later, she changed her story. Read Candra's story, which inspired the Lifetime movie, 'A Murder to Remember.'