Here is an interesting article about a study being conducted by national traffic safety authorities. No one knows what impact marijuana, medical or otherwise, has on a person’s ability to drive and for how long. With alcohol there are many medical studies that show when a person’s ability to drive becomes impaired. Colorado is wrestling with how to handle marijuana impaired driving in their state law since it was decriminalized for recreational use in their state last year. I thought you might find it interesting as Michigan determines whether it should be decriminalized.