Actually, he presented facts. According to the 2015 study by the National Highway Traffic Safety Administration: "Drivers testing positive for THC were overrepresented in the crash-involved (case) population. However, when
demographic factors (age and gender) and alcohol use were controlled, the study did not find an increase in population based crash risk associated with THC use." Here is the link if you dare to have your groundless opinion challenged: https://www.nhtsa.gov/press-releases/nhtsa-releases-two-new-studies-impaired-driving-us-roads   Read the Crash Risk Study Executive Summary. Do you have better sources that support your opinion?