Impacts of Legalized Pot on Traffic Safety

One unforeseen consequence of the medical marijuana here in Michigan and now the legalized pot in Colorado and Washington state is the impact on traffic safety.  When we govern by referendum, there isn’t a thorough vetting of the consequences of some changes.  Like this consequence.  

What is the amount of marijuana one can ingest and still be a safe driver?  That is simply unknown and being debated around the country.  Unlike alcohol there are no testing standards or devices for us to use to determine impairment other than bad driving-which means that we have to try to figure it out after a high driver has smashed into a few cars.   Currently, Michigan law says that any amount is illegal while driving, medical card or not. 

It will be interesting to watch what happens in the driving high controversy.