when its used as medicine, most could give a fuck less bout that preservation sativa story,they want potent relief lmfao. From what I understand, some of that mexican brick came from cali seeds, some boys been giving some good seeds to Mexico with the climate for some time now.. Think they still do the layer stack and dry after harvest, but I suspect thats why some mexican brick is horseshit and other batches, not as bad. Having said that, at one time it was all that was around when younger and I'll never smoke it again, I'd go without now after growing my own. You can keep them heavy sats, Im an anxious cat, no use for those. Could care less if they went extinct or not, lol, jmho