The most common adulterants in the samples tested by the Bunk Police kits this summer were the synthetic drugs known as bath salts, including the cathinones MDPV, methylone and mephedrone. Bath salts were so prevalent that some of the concert goers who were convinced they were "rolling" on real MDMA were shocked when tests revealed they were taking bath salts. Every hit of Molly they'd ever taken, was probably bath salts, so they didn't know the difference.