Earlier quoted context omitted.
I'll explain it, though I didn't downvote you. Marijuana is illegal right now. That didn't stop that bad stuff from happening to you or your sister. Turn it into a public health issue and people like your sister-in-law will have more resources to get help. I also have skepticism that marijuana caused someone to crash into your car. It has not been proven that weed has much if any effect on driving ability, especially…
You are quite clearly an absolute dire example of a complete fucking moron if you think that smoking weed doesn't affect your driving. It affects your judgement, your motor skills, slows your reaction time and so can the withdrawal symptoms. I'm not even going to link a page because it's that easy to find supporting information that is credible.
http://www.ncbi.nlm.nih.gov/pubmed/24411797 http://www.nytimes.com/2014/02/18/health/driving-under-the-i...
The study’s lead author, Eduardo Romano, a senior research scientist at the Pacific Institute for Research and Evaluation, said that once he adjusted for demographics and the presence of alcohol, marijuana did not statistically increase the risk of a crash.