By Bill Shields, WBZ-TVBy Bill Shields

HALIFAX (CBS) – A Halifax teenager, already in trouble with police for a crash one year ago, may be part of a larger drug investigation.

Monica Knight was driving a BMW last year, driving three of her friends to Silver Lake High School, when she crashed into a bus. Her friends were seriously injured, and one, Eva Lipton, is still on life support.

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Court documents reveal that Knight was smoking marijuana just prior to the accident.

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She has been held in jail for the past week, after she tested positive for marijuana, a violation of her probation order. She was released Friday, after being fitted with a GPS bracelet.

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WBZ has learned that Knight may be part of a larger investigation, into marijuana distribution in the Halifax area.

Bill Shields