The St. Clair County Drug Task Force reports on three busts this week.  The first took place Thursday along the Rails to Trails Bike Path that's between Range and Griswold as deputies arrested a 57-year old Port Huron Township man who police say was operating a campsite along the trail and producing methamphetamines.  The second was also on Thursday in St. Clair Township on I-94 and the St. Clair Highway where a 30-year old Port Huron man was taken into custody when officers found about $15,000 worth of marijuana in his vehicle.  The third incident occurred early Friday morning in the 2000 block of Michigan in Port Huron Township.  Officers arrested two men from Port Huron Township and seized about $2,000 worth of heroin and 42 marijuana plants in the back yard.