Gardiner gives initial approval to cannabis testing lab The Massachusetts-based MCR Labs must also secure state approvals from the Office of Marijuana Policy and the Center for Disease Control as well as a business license from the Gardiner City Council. Joe Phelan/Kennebec Journal GARDINER —A marijuana testing lab based in Massachusetts is making plans to expand into central Maine. On Wednesday, an approval by the Gardiner Planning Board paved the way for MCR Labs to open a facility in the Libby Hill Business Park. If the company is able to secure all required approvals, it would be the first testing lab operating in central Maine with an opening date targeted for late spring.