doctor endorsement for pot

LANSING, MI (AP)--   Some of the first big changes to Michigan's medical-marijuana law since it was approved by voters in 2008 are set to begin. 

Democratic Representative Phil Cavanagh of Redford Township in Wayne County says the changes that went into effect Monday clarify and lend credibility to the act.

The measures define the type of doctor-patient relationship that is needed before medical marijuana use can be certified. For example, a doctor must complete a face-to-face evaluation of the patient.