[totalrune]

Not really like your original idea.

If she broke in somewhere and she got a little bit on her clothes, she would have to destroy the clothing or it would be traced back to her. She wouldn't want to get it on her car or skin.

Smartw*ter is a proprietary forensic asset marking system that is applied to personal, commercial, and industrial items of value to deter theft and to identify culprits for prosecution. The non-hazardous liquid leaves a long-lasting and unique identifier that is invisible to the naked eye except under an ultraviolet black light. The Smartw*ter anti-criminal system is marketed globally by Smartw*ter Technology Ltd.