Suffolk County Sheriff Steve Tompkins pleaded not guilty to corruption charges Thursday at federal court in Boston, with his lawyer saying in brief remarks outside the court,“mistakes are made.”

After being arrested on extortion charges earlier this month, Suffolk County Sheriff Steven Tompkins pleaded not guilty in court on Thursday. WBZ-TV's Kristina Rex reports.

Prosecutors say the Suffolk County Sheriff used his post to get stock in a cannabis company — and then demand the return of his $50,000 investment.