ST. LOUIS, MO (WTVB) - It seems more and more you have to watch your back to make sure there’s not some meth cooking nearby whether it be in a motel room like what happened this week in Coldwater or even inside a Walmart store, which was the case yesterday in suburban St. Louis, Missouri.

Police say it happened last night when a security guard caught the woman stealing, and placed her in an office until police could come. The woman apparently had a mobile meth lab with her, and began concocting the drug while she waited for cops. 

The Walmart was evacuated, and a Hazmat crew was called in to clean up the chemicals. Police say employees acted quickly to make sure no one was injured.