The authors of a US study that said Ecstasy caused brain damage had to issue this statement:

We write to retract our report...following our recent discovery that the drug used to treat all but one animal in that report came from a bottle that contained methamphetamine instead of the intended drug (Ecstasy).

D'oh! They did add, "this apparent labelling error does not call into question the results of multiple previous studies demonstrating the serotonin neurotoxic potential of MDMA (Ecstasy) in various animal species, including several nonhuman primate species." Damn, like anyone is listening past the first admission that the study is wrong.