Police are advising hospitals and doctors around Christian County to report anyone seeking treatment for anhydrous ammonia burns.
Officials say thieves, likely meth producers, caused a leak at an Ag company's storage tank on Oct. 29.
The president of Agri-Chem says thieves cut through a fence, broke a lock off a storage tank and unplugged a release valve to get to the ammonia but the hole was never replugged.
The thieves also left their clothing nearby, probably because contaminated clothing can cause burns to the skin.
A spreading cloud of ammonia forced the evacuation of a nearby elementary school as well as businesses and homes within a mile of the company.
Anhydrous ammonia is injected into the soil as a nutrient for crops.
It's also an ingredient for making methamphetamine, an illegal and highly addictive chemical drug.
So far, no arrests have been reported.