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The U.S. attorney's office in Utah confirmed Thursday that there is an "open investigation" of Donna Weinholtz, wife of Democratic gubernatorial candidate Mike Weinholtz, for alleged marijuana possession.

Mike Weinholtz first spoke about the investigation after winning the Democratic nomination in April. He told convention attendees that Donna Weinholtz uses the illegal drug to treat severe arthritis and nerve pain.

"She has only used cannabis for medical reasons for the relief of chronic pain," Weinholtz said in his speech.

Melodie Rydalch, a spokeswoman for the U.S. attorney's office in Utah, said she could not comment on the details of the investigation, but she said U.S. Postal Service inspectors and the Department of Homeland Security were looking into the matter.

After Rydalch confirmed the investigation Thursday, Weinholtz's campaign released a statement: "As far as we know, the status of the investigation is the same today as it has been for over two months and remains an open investigation. No decision has been made as to whether Donna will, in fact, be prosecuted, or if so, even by whom. When we have more information to share, we will do so at the appropriate time."

Twitter: @CourtneyLTanner