Posted in Article Ontario study shows illicit edibles have significantly less THC than advertised, high levels of pesticides 2022-04-09 Leave a Comment on Ontario study shows illicit edibles have significantly less THC than advertised, high levels of pesticides The Ontario Cannabis Store has released a study looking at testing results of legal and illegal cannabis edibles. Source: Ontario study shows illicit edibles have significantly less THC than advertised, high levels of pesticides This is one of the benefits of legal cannabis.