During the investigation into the 2004 Madrid train bombings, scientists used DNA from a toothbrush to identify one of the suspects as North African in origin.

BBC: Painting a suspect's portrait with DNA

He said each is given a canteen with water, shampoo, toothpaste, a toothbrush, soap and two buckets, one for hygiene and one for washing.

CNN: U.S. general: Detainees treated humanely