R&R's =mescaline???

i was wondering if anyone could help us out here... he had swapped fer other pills R&R's heye were smallish though not unusually small pink pills crumbly with two backwards r's printed on them.. one slightly above the other... apparently they were mescaline+MDMA any ideas?? he claimed that it seemed acurate after he had one.. i just though that mescaline was too inactive at small doses to be in a pill....?
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fear and loathing on the dragons tail =^_^=