Scientists have devised a hair test that the government hopes will help check the alibis of terrorist suspects and asylum seekers. They believe new laser scans of individual hair strands can reveal where a person has been living for the previous two months. Researchers at the National Metrology Institute in Teddington, Middlesex, have developed the laser to measure tiny changes in hair that are caused by diet or the immediate environment.

I hope they prove this before they start acting on the results ...