http://www.asahi.com/english/Herald-asahi/TKY200512140135.html
"For the last decade, police in Tokyo have been using state-of-the-art forensic techniques to nab men who grope women on crowded trains. Police investigators are using a technique to lift tiny traces of fabric fibers from a suspect's palm and match them with the victim's clothes. The evidence is so hard to refute that at least one suspect who was confronted with it retracted his denial and confessed on the spot. The scientific tool is proving a boon to the police, who used to have a hard time proving sexual molestation cases because there was precious little material evidence. The technique can also clear the names of the wrongly accused."
