No one should drive after consuming cannabis, alcohol, pain killers or when they are extremely tired. My sympathies to anyone who lost a loved one in an accident - no matter the cause. However, this article states "Positive test results reflected in the NHTSA data do not indicate whether a driver was high at the time of the crash since traces of marijuana use from weeks earlier also can appear as a positive result." In other words positive test results are almost worthless and this article is yet another example of many anti-cannabis article the Post has written since legalization. Alcohol is the real problem.