http://digbig.com/4mmba
"The Swiss system of monitoring the movement of explosives with micro-tags may be adopted across Europe following an apparent terrorist plot to blow up aircraft. Identification taggants are microscopic particles usually made of multiple layers of different coloured plastic strips bonded to a magnetic material. The coloured strips make up a unique bar code that can be used to identify the explosive material. Other taggants employ a chemical "fingerprint" that can be identified by sniffer dogs or specialist machines. They are designed to survive the impact of an explosion.The technology was first developed by US technology group 3M in the 1970s." [Top Topic]
