An Oregon City man who told a government hotline last summer his mother had been harmed by bottled water has pleaded guilty to making a false report of consumer product tampering, a federal crime that carries a potential five-year prison term.

He may have been stoned.

The Oregonian reports Curtis A. Purdy, 34 (right, exactly as shown), acknowledged in court papers that he lied last summer to the U.S. Food and Drug Administration’s Consumer Complaint Line about how his mother came to be injured after drinking a bottle of Crystal Geyser water.

Purdy reported to the FDA hotline on Sept. 1 that the water, purchased from an Albertson’s grocery, had caused burns to his mom’s mouth, throat and stomach and that she had vomited and suffered diarrhea, according to a criminal complaint affidavit.

He later told investigators that he had put in the bottle some rubbing alcohol, which he kept around to clean his marijuana pipes. His memory of the incident was hazy, according to the complaint, because he was undergoing opiate withdrawal.