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Heavy rains and snow run-off carry manure into Milwaukee's water supply in 1993, leading to an epidemic of gastrointestinal illness affecting 400,000 people.

Forensic Files

Deadly Parasites

A man arrested for the sexual assault and attempted murder of a boy in a European country becomes linked to a murder in Zurich, Switzerland, through analysis of microorganisms.

Micro-Clues

A man kills two people with bombs in an effort to get investors off his back, but authorities catch onto him and he becomes sentenced to life with no chance of parole.

Postal Mortem

Evidence reveals a teacher who complained of being stalked and harassed by another teacher was scamming police.

Sealed With a Kiss

A well-liked bank vice president collapses and dies after taking pain pills laced with cyanide; the search for a motive reveals a callous suspect who had murdered once before.

Something's Fishy

When dozens of infants develop serious breathing problems in the Cleveland area, doctors and investigators search high and low for the cause.

Fatal Fungus

Handwriting and simple doodles complicate a car-bomb case and an alleged self-defense shooting in a peaceful British farming village as police uncover a husband's plot to kill his wife for insurance money.

The Blood Trail

When a woman exhibits strange flu-like symptoms before dying, investigators discover someone added thallium to her soda; detectives initially suspect her husband, but the case takes a sinister turn.

Bitter Potion

When a woman goes missing from her home, police focus on her husband when an airline luggage tag and luminol point to an affair and murder; footage from a TV crew and Coast Guard photographs lead investigators to the suspect's missing boat.

Sex, Lies and DNA

Experts attempt to discover the source of heavy fog on Highway I-75 in Tennessee, which caused a 99-car accident and 12 deaths.

Killer Fog

When an English couple go missing, police suspect their son killed them and must rely on mud and blood samples found in the couple's two cars to find their bodies.

The Dirty Deed

Florida police search for a serial rapist and murderer who left small red fibers on each of his 10 victims.

The Common Thread

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S2 E6 | The Blood Trail