Why do I not doubt that? 
I think those drugs are taken by many, many people. So maybe its ok.
My guess is that the people who make these rules are searching carefully through their files to get a handle on the magnitude of this issue, and to consider whether any changes are in order because of what has happened. It’s fair to say that this doesn’t seem to have been a particular problem in the past, but that’s of little comfort to the people who are gone, and their families.