http://www.jointogether.org/sa/news/summaries/reader/0%2C1854%2C575978%2C00.html
"A chemical that stains methamphetamine users' skin as well as meth-making equipment could be added to anhydrous ammonia fertilizer, often stolen from farmers to make the drug. Advocates for adding GloTell to fertilizer say it would make it easier for police to spot meth makers and users. "
