^^ Those test results are just plain bizarre, MD
I'd always put these occasional, senseless and freaky test results down to this:
In other words, somebody messing about making stupid pills for a laugh - must be kinda funny to send a blatantly ridiculous pill off for testing then watch the news headlines about your home-made "coke/heroin pills" flow from it. Suspect it may be more complex than that now given the sheer quantity - and some of those are widespread pills rather than just obvious one-offs. Very odd.
All I can think is that it's a mixture of mischief-making, morons pressing pills who actually believe that it's normal and effective, and possibly even an attempt to fool test kits by showing positive for desirable actives when it's actually mostly just pipz, caffeine etc in the pill. Can't recall what coke (or heroin, for that matter) shows up as on EZ-Test but possibly a possibility. I know many pills in Europe are made with just a few mg (not enough to be active) of MDMA to turn Marquis black when the bulk of the actives are actually pipz. Very strange indeed