MUSKOGEE, OK - Two McAlester residents pleaded guilty to federal drug charges in an elaborate meth scheme.

The U.S. Attorney's Office tell us 53-year-old Larry Piprich and 32-year-old Shila Parker would travel all over Oklahoma and North Texas, buying up all the pseudophedrine they could. They say the duo bought more than 9 grams of the drug, the active ingredient used in making meth, over 40 times in a single day.

Formal sentencing is pending. Both remain in the custody of U.S. Marshals.