It happened during a traffic stop on Tuesday near Coalinga.
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The Fresno County Sheriff's Office says deputies found 25-year-old Miguel Romero Reyes moving the drugs.
He had about 200,000 fentanyl pills worth $600,000.
Reyes is from Seattle. He was booked into the Fresno County Jail with a bail of $200,000.
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Deputies are warning the community to be mindful of fake pills and to only take medicines given by their doctor.
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