For business and stores that are frequently targeted by thieves, a device that sprays an invisible DNA mist on the robbers that won't wash off for weeks will be a way to identify the criminals.  The device, an orange box the size of a phone book, is installed in the business or store. An expert says people can't smell or see the DNA when it is being sprayed and it sinks into the skin and hair where it sits for weeks. When police bring in a suspected criminal the "DNA" shows up under ultraviolent light and contains a DNA code that police stations can scan.  The SelectaDNA Spray was developed in 2008 and is already being used in nine countries and soon may be used in banks and retail stores in the U.S.

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