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FRAMINGHAM, Mass. (AP) — Police in Massachusetts say tests on a substance they believed to have been a “fentanyl mix” came out negative.

The MetroWest Daily News reports police had to decontaminate a station cell after a prisoner supposedly smuggled the substance inside.

Framingham Police Lt. Patricia Grigas says tests revealed a “pharmaceutical-grade drug.”

A small amount of the opioid fentanyl can cause a potentially-deadly reaction, and is 30 to 50 times more powerful than heroin.

Prisoners in the cellblock were evacuated and the area was decontaminated. The station can hold 21 prisoners.

Police haven’t released the identity of the prisoner involved but said charges are pending.

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Information from: MetroWest Daily News (Framingham, Mass.), http://www.metrowestdailynews.com