A Lambton OPP officer is facing criminal charges. Police say an investigation conducted by the OPP Professional Standards Branch resulted in the arrest Tuesday of 31-year-old Cst. Craig Johnston. He's charged with obstruction of justice, and breach of trust, and is to appear in Sarnia court January 7. Johnston has been a member of the OPP for 10 years and is currently suspended with pay. Further details have not been released.