https://en.wikipedia.org/wiki/File:Rational_scale_to_assess_...
https://en.wikipedia.org/wiki/File:Rational_scale_to_assess_...
http://www.globalpost.com/dispatch/news/regions/americas/can...
"12th death linked to tainted ecstasy in Alberta, B.C."
http://www.vancouversun.com/12th+death+linked+tainted+ecstas...
"8 Alberta deaths linked to ecstasy-like drug"
http://www.cbc.ca/news/canada/calgary/story/2012/01/31/calga...
This is especially surprising since God explicitly told you not to eat pork almost 3000years ago.
Remember kids, pork and shellfish are evil - just so no.
One study of 52 users that where hand selected out of 1500 that showed no cognitive impairment. http://www.addictionjournal.org/viewpressrelease.asp?pr=147 Others studies both before and after have demonstrated issues. The problem is it's hard to find good data on individuals before they started heavy use, and sleep deprivation and dehydration are linked to long term cognitive impairment.
However, if you look at the existing literature there is no large scale and long term study's demonstrating it's safety. And a lot of evidence that MDMA is dangerous.
Furthermore, these risks must be balanced against the very tangible and easily observable psychological benefits. There's a reason psychotherapists used this drug.
Going to prison.
Putting people in prison for harming themselves is the height of absurdity.