MISSOULA, Mont. (AP) — The classrooms at a Montana YMCA learning center where a former employee is accused of having smoked methamphetamine on the job have been tested for drug residue.

The Missoulian reported Monday that the full laboratory tests deemed the classrooms to be clean of drug residue, but YMCA executive director Heather Foster said other areas at the facility did test positive.

The YMCA estimates the full cleanup will take at least a month.

The employee was charged with felonies for drug possession, endangering the welfare of a child and criminal mischief after police were called last week to the Missoula YMCA Learning Center.

Charging documents say police found what was termed a "drug den" in a hollowed-out cabinet in the laundry room of the facility.

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Information from: Missoulian, http://www.missoulian.com