[rastus macgill]

I suspect there were no mislabelled bottles.The "study" was a fraud in an attempt to get the "right" results.
Legit pure lab grade MDMA is not a high volume production item and is no doubt closely tracked and handled.I don't believe those who have license to legally manufacture and distribute schedule I substances make these kind of mistakes.

[DBrow]

"The "study" was a fraud in an attempt to get the "right" results. "

If they were going to "dry-lab" it, there are much less expensive fraud methods than killing research primates.

Peer-reviewed science may work slowly, but it (usually) produces good results. Before you publish, others in your field go over your paper preprint and sometimes ask for clarifying information. They try to see if your paper makes sense. After you publish, the next issue will have a letters column in which any weaknesses are ripped apart, then others try to replicate your results. If they are not reproducible, then your initial research is questioned, and in this case they found a mislabeled bottle. This matched their test results; those concerned could see that the substitution most likely caused the effects that they saw.

Fraud is possible but is usually discovered. These guys made an honest, but very serious mistake, admitted it, and are going to correct it. The peer reviewers perhaps should have questioned such severe toxicity, but in this case they did not. Many papers are submitted in a given field, and not that many are published.

Imagine politicians, Drug Czars, and teachers doing this? Admitting that they made a mistake, taking responsibility for it?

If they started out intending fraud, the fact that the wrong drug was administered probably would never come out. Whoever would fund such a fraudulent study, and be willing to kill lab animals to push their agenda, would just expand the vast conspiracy a bit and cover it up.