The Medical Examiner’s toxicology report stated that both Lavin and Higgins had THC, or tetrahydrocannabinol, in their system. THC is the chemical compound found in marijuana.
Links
[1] http://www.capecodtoday.com/article/2017/04/03/231441-High-speed-reckless-driving-factors-Higgins-Lavin-fatal-crash
[2] http://rethinkpot.org/tags/cape-cod
[3] http://rethinkpot.org/tags/fatalities