A Whitehorse woman charged with the attempted murder of an RCMP officer was sentenced Friday for trying to give her co-accused some marijuana during his preliminary hearing.

Jessica Johnson and Chris Cornell are facing charges stemming from a break-in at a Haines Junction grocery store and a police chase on the Alaska Highway in September 2011.

During Cornell's preliminary hearing, a police officer saw her toss a small black bag towards Cornell as he sat at a table in the courtroom.

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Jessica Johnson and Chris Cornell are facing charges stemming from a break-in at a Haines Junction grocery store and a police chase on the Alaska Highway in September 2011. (CBC)

The officer picked up the bag and found it contained marijuana.

Johnson was arrested. When she was searched a short time later, a pipe, a syringe and more drugs were found hidden on her body.

Johnson pleaded guilty to the offence and was sentenced to 10 months in jail. With credit for time served she has four months left.

She and Cornell go to trial on the attempted murder charges in September.