March 13, 2015 4:33 PM EDT

Police say an “active meth lab” was found inside a backpack in the men’s restroom at a Walmart in Muncie, Ind., Thursday night, according to a news release from the state police department.

While the Pendleton District Meth Suppression Team dismantled the meth lab and got the chemicals out of the store, the men’s and women’s restrooms would still need to be “thoroughly decontaminated” before customers could use them again, police said.

In the statement, Indiana State Police said this strategy of cooking meth is not uncommon:

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Write to Olivia B. Waxman at olivia.waxman@time.com.

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