Here's a link to a Vice documentary talking about it: http://www.vice.com/video/back-from-the-brink-heroins-antido...
This is why there are many opiate overdoses where the victim is starting to use after being sober for some time - they go back to the doses that were normal for them not so long ago, but their body chemistry has changed enough that those dosages are now dangerous.
See for example http://www.bmj.com/content/326/7396/959
Citation please.
Anyhow, here's one result to get you started: http://www.ncbi.nlm.nih.gov/pubmed/4043895
Assuming it were true, it's odd that a PubMed search finds no more recent papers. No matter what, it's decidedly rare. Renee Honaker was believed to have died of LSD overdose. Quoting http://www.wvgazette.com/News/201303090102 :
> Downey said his initial research into LSD-related fatalities hasn't returned very many reported cases. ... Dr. Elizabeth Sharman, head of the West Virginia Poison Center, hadn't researched the case but said it's the first fatality she's heard of in the state.
Later, "It turns out that the drug Todd and Reneee Honaker took was not LSD after all; according to WSAZ, a TV station in Charleston, it was an NBOMe compound." - http://www.forbes.com/sites/jacobsullum/2013/10/21/lsd-did-n...
NBOMe is also a psychedelic, so falls under the general thesis of the OP. However, it's a rather recent psychedelic so cannot be the reason for the prohibition.
http://www.economist.com/blogs/dailychart/2010/11/drugs_caus...
(That list has alcohol at the top but that's mainly due to drunk people's tendency to harm others via driving or violence)