Mich. Comp. Laws § 338.1708

Sec. 8. A person, including city, county or state employees, shall not use or attempt to use any instrumentation or mechanical device for the purpose of detecting deception, verifying truthfulness or reporting a diagnostic opinion regarding either of these; purport to detect deception or verify truthfulness through instrumentation or mechanical devices; advertise or represent that he can or does offer the service of detecting deception, verifying truthfulness or reporting a diagnostic opinion regarding an individual's deception or truthfulness through instrumentation or mechanical devices; attempt to hold himself out as a polygraph examiner or refer to himself by any terminology which would indicate or convey the impression that he can or does purport to detect deception or verify truthfulness through instrumentation; or use any of the technical descriptive terminology peculiar to, or interchangeable with, the administration of polygraph examinations, the interpretation thereof or the detection of deception and the verification of truthfulness resulting therefrom without first securing a license as provided in this act.