BOSTON (AP) — A former nurse pleaded guilty Thursday to stealing opioid pain medication from the hospital emergency room where he worked for his personal use and replacing the drugs with a saline solution, federal prosecutors said.

Mark Croft, 48, of West Boylston, pleaded guilty to tampering with a consumer product and acquiring a controlled substance by deception and subterfuge, according to the U.S. attorney’s office in Boston.

Sentencing is scheduled for May 20.

Croft in January 2016 while working at Beverly Hospital withdrew painkillers from prefilled syringes from an automated dispensing machine in the hospital’s emergency department, according to court documents.

In some instances, Croft replaced the medication he removed with saline in an attempt to conceal his conduct.

Croft took the medications for his own use, according to court documents.

A hospital spokeswoman previously said that no patients were affected by the thefts and additional safeguards have since been implemented.

The tampering charge provides for a sentence of up to 10 years in prison, while the charge of obtaining a controlled substance by deception provides for a sentence of up to four years in prison.

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