Judge reinstates charges in breathalyzer case involving Kalamazoo man file photo and last updated 2021-05-11 14:34:54-04 LANSING, Mich. â A circuit court judge has reinstated charges against one of two men contracted to service breath alcohol testing instruments used by law enforcement. Michigan Attorney General Dana Nessel made the announcement in a news release Tuesday. The instrument, DataMaster DMT, is more commonly known as a breathalyzer and measures the alcohol level of drivers suspected of drunk driving. Last year, Nessel filed charges against Andrew Clark of Oxford and David John of Kalamazoo for creating false documents related to certain diagnostic tests and repairs on DataMaster DMTs.