Michigan State Police are investigating possible fraud involving contract employees of a firm that calibrates breathalyzer machines around the state. The agency says it has stopped its contract with Datamaster vendor, Intoximeters, and is advising officers to use blood draws to determine drunk driving until it has been able to confirm the machines are all properly calibrated. The agency says its investigation so far has uncovered discrepancies at several police departments, including at the Niles Police Department and the Van Buren County Sheriff’s Department. When a discrepancy is found, state police say the results can be double checked through additional testing. Michigan State Police say they will pursue criminal charges where it is determined an employee of the breathalyzer vendor committed fraud. In the meantime, the agency has taken all of the 203 affected machines out of service.