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“I’m personally devastated,” he said. “Health-care workers take very seriously the public trust and public safety.”

Police said a woman was injected with a sedative that put her to sleep during an electroencephalogram (EEG) procedure on April 11. She said when she woke up in the Outpatient EEG Clinic at University Hospital, she was being sexually assaulted, police said.

Police began their investigation May 11 after the assault was reported to them.

Vincent Gauthier, 24, of London is charged with one count of sexual assault and one count of overcoming resistance by administering or attempting to administer a drug.

Gauthier was hired by LHSC in May 2015 and was based at Victoria Hospital until 2016, police said. He then transferred to University Hospital.

LHSC suspended Gauthier April 25 and has since fired him.

An electroencephalogram is used to detect electrical activity and abnormalities in the brain, said Woods, who refused to comment on the procedure involving the female patient.

Sedating a patient during the procedure isn’t common, he said.

“It would be a relatively rare EEG if sedation was involved.”

Electroencephalograms typically take between 30 and 60 minutes.

Woods wouldn’t comment on the drug used to sedate the woman, but he said the hospital confirmed no drugs were missing and that there was “no miscount between what should have been administered and what was administered.”

The hospital is mailing letters to more than 800 former patients treated by Gauthier, asking them to come forward if something similar happened to them.