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A 17-year-old has been arrested and charged with drug possession after a friend posted on the teen's Facebook page that he needed drugs.

A police officer also recognized the two from a video of a drug party in June.

A Greenfield police officer was patrolling in his car Aug. 30 when he noticed two men he recognized from his assignment as a police school liaison officer at Greenfield High School. Earlier in the day, he had seen one of them post a statement on the other's Facebook page that indicated he wanted drugs. The teen behind the page, Justin J. Cervera, had replied, asking the guy to call him.

The same officer had previously seen a video of the two apparently smoking marijuana with other juveniles in June 2011, called "Reefer party for my birthday."

He stopped the two on the street and Cervera emptied his pockets, revealing a white prescription bottle with drugs. Cervera was arrested and was charged Thursday with possession of narcotics and marijuana. He faces up to four years in prison and $11,000 in fines.

The settings on the teens' Facebook pages have since been changed so most information, including pictures and videos, are private.