Post 263746 (https://www.thevespiary.org/talk/index.php?topic=9060.msg26374600#msg26374600)
(cornelius: "novel mescaline extraction", Methods Discourse) for extraction from San Pedro. It is reasonably quick, and much less messy than extraction from dried cactus. It uses only DCM as a solvent, and starts with fresh cactus. It has been tried here, and verified to work. It's feasible that with some extra cleanup, gassing with HCl might yield crystals, though no-one here has felt the need to go any further than the resultant oil.