The Calhoun County Sheriff's Department discovered a meth lab inside of a vehicle early Sunday morning.
It happened during a traffic stop in Pennfield Township, near Battle Creek.
Sheriff's deputies detained three people inside the vehicle.
They discovered that a 40-year-old passenger had meth making materials as they were traveling down the road.
The passenger was arrested and taken to the Calhoun County Jail.
The two other passengers were interviewed and later released.