A pilot program just completed in Michigan for roadside drug testing could have implications for drivers under the new marijuana law.
The year-long pilot program allowed state police to conduct roadside tests for five drugs, including marijuana.
Chris Johnson is with the Michigan Municipal League. He said THC can stay in the body long after marijuana is used.
“I think one of the difficult parts now with the new law is that there is no set standard for THC levels in the blood or in the body.”
Johnson said other states that allow recreational marijuana use have created THC standards.
The test, which involves an oral swab, was piloted in Berrien, Washtenaw, Delta, St. Clair, and Kent counties.
Officials with the State Police say they won’t be releasing the results of the program - and how effective the roadside tests were - until sometime in February.
Police officials say impaired driving is first identified by an officers observations of a drivers behavior.