One of the FBI鈥檚 microscopic hair analysis experts gets it very wrong. And he's not alone. Read more
now playing
2. Hair Disaster
One of the FBI鈥檚 microscopic hair analysis experts gets it very wrong. And he's not alone.
3. False Confessions
The police use coercive tactics to extract confessions from the Guildford Four.
4. Fire Flashover
An expert thinks a crime scene indicates arson. But then the fire science changes.
5. DNA Transfer
The police find a stranger鈥檚 DNA on a victim鈥檚 fingernails. Can a DNA match be wrong?
