CENTRALIA, Wash. - A security guard at a juvenile detention center was arrested during a SWAT team raid on a home where marijuana was being readied for sale, police said.

Roy D. Clark, 26, a security officer at Green Hill School in Chehalis, was one of four people caught in the act of weighing and packaging marijuana apparently for sales, Centralia police allege.

Clark was booked into jail for investigation of delivery of a controlled substance and possession of marijuana with intent to deliver, said Detective Chris Fitzgerald of the Centralia Police Department.

The raid took place Thursday evening at a home at 506 S. Cedar Street in Centralia following a three-week investigation and the issuance of two search warrants.

Officers found Clark and the three other suspects weighing and packaging marijuana in a detached garage at the rear of the residence, Fitzgerald said.

The three other suspects are being referred for possible charges of felony marijuana possession.

Officers seized Clark’s 2005 Dodge Ram pick-up, approximately $2,000 in cash, marijuana and paraphernalia.

DSHS officials say Clark will be terminated from his job.