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Two years after an 18-year-old's murder in Albion, Mich., a tiny drop of blood and burned bones lead police to her killers.

Forensic Files

Out of the Ashes

A 2-year-old boy's brain seizures and breathing problems baffle doctors until they learn the mother exhibits signs of Munchausen syndrome by proxy, a rare condition that led her to physically abuse her son and contributed to her daughter's death.

Broken Bond

A speck of bicycle paint and a speck of nickel left over from a collision with a twice-convicted child molester's car provide critical clues in the murder of a 9-year-old.

Speck of Evidence

Investigators reopen a case from 1984 involving the rape of a young Virginia woman when DNA testing refutes her identification of the rapist and calls everything into question, leading to the accused person's exoneration.

Crime Seen

When a young woman goes missing on the way to the train station, investigators use a strand of hair and a bloody pillowcase to find a suspect.

Beaten by a Hair

Detectives learn that a genetic disorder caused the deaths of a woman's children, resulting in an overturned conviction.

Deadly Formula

Forensic scientists provide authorities with evidence that a death deemed accidental 20 years ago was actually murder.

Grave Evidence

Investigators use obscure evidence to find the person responsible for killing justice officials with mail bombs in the South.

Deadly Delivery

After the discovery of a skull in the forest near a boy scout camp, police use facial reconstruction to identify the body.

The Talking Skull

In a series of murders near Sacramento, Calif., a killer gags and molests prostitutes, cuts their clothes in random patterns and cuts off their hair; microscopic evidence helps solve the case.

Knot for Everyone

Autopsies reveal that a string of unexplained deaths in Omaha resulted from poison-induced liver disintegration.

Without a Trace

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Retracing the steps of real investigations with interviews and dramatic re-creations as experts draw on forensic science to solve baffling crimes and other mysteries.

S3 E1 | Without a Trace