MITCHELL, S.D. -

Three of the six Mitchell residents who were indicted on drug-related charges last week have pleaded not guilty.

Police say 27-year-old Jared Nespor, 27-year-old Mellissa Schuppan and 35-year-old Skila Schuppan entered their not guilty pleas Tuesday in Mitchell.

The South Dakota attorney general's office has said the charges against the trio stem from the result of a search of Nespor's home. Nespor, who was on probation, faces four counts. Melissa Schuppan faces six counts, while Skila Schuppan faces four counts.

Assistant Attorney General Doug Barnett says Mellissa Schuppan sent him an unsolicited letter in which she made admissions to her "engagement in criminal activity."

Trials for the three individuals have been scheduled for December.

It wasn't immediately clear Wednesday if the defendants have attorneys who could comment on their behalf.