(NEWSER) – Like a free DNA spray with that? Following a spate of robberies, McDonald's outlets across Australia are installing DNA-spray devices over their doors to douse fleeing robbers with an indelible mark, the Daily Mailreports. The non-toxic spray will mark alleged thieves with a DNA code that lasts for months and shows up bright blue under the light of police UV flashlights—tying crooks to the scene of the crime. "It's a great deterrent," a McDonald's spokeswoman tells the Sydney Morning Herald.
