@rodman99999
altered state of mind can or cannot be beneficial. if it wouldn't be beneficial, I wouldn't even try it. I wouldn't try to jump stoned being instructor either...
also bear in mind, that there's no test can identify the magnitude of mind impairment of marijuana ESPECIALLY after 2 hours! if marijuana is found in system of skydiving INSTRUCTOR, it still impossible to DEFINE weather the deadly accident occurred of impairment. Often and common assumptions presented as definitions for learning material.