CASS COUNTY, Mich. - A Mount Clemens, Michigan, resident was found guilty of possession of methamphetamine on Tuesday, the Cass County Prosecutor's Office announced.

The jury deliberated for just over an hour before finding 39-year-old Lisa Heise guilty.

According to case documents, an officer with the Ontwa Township-Edwardsburg Police Department pulled over a vehicle that Heise was traveling in.

Heise, the passenger of the vehicle, agreed to a search of the vehicle, which she said was hers, reports said.

During the search, the officer found numerous pills in a container in her purse.

Some of the pills were prescribed to Heise but one yellow pill later tested positive for methamphetamine, police said.

Heise was found not guilty on the charge of permitting the operation of a motor vehicle without insurance.

Her sentencing is scheduled for October 7.

Cass County Prosecutor Victor Fitz said, "The only valid prescription for meth in Cass County is don't possess it."