all but one of the animals were injected not with ecstasy but with methamphetamine, or "speed"

Results Retracted On Ecstasy Study (washingtonpost.com)

Scientists at Johns Hopkins University who last year published a frightening and controversial report suggesting that a single evening's use of the illicit drug ecstasy could cause permanent brain damage and Parkinson's disease are retracting their research in its entirety, saying the drug they used in their experiments was not ecstasy after all.
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