Is Delta 9 THC Legal in Texas? Delta 9 THC is the psychoactive substance found in cannabis plants that give users a high. But Delta 9 THC is also one of the most dangerous cannabinoids. Federal Government has placed delta-9 THC on Schedule 1 of its list of dangerous drugs. https://legal-delta-9-thc80845.blogspothub.com/20113906/5-the-5-reasons-delta-9-legal-is-actually-a-great-thing