[perrylaj]

'Typically' seems unlikely to me. I am not up to speed (no pun intended) on drug manufacturing/distribution, but years ago I wrote a psychopharmacology meta-study on the topic and most research I remember found that 'mixtures' or 'cuts' with two 'mainstream' active drugs were very uncommon due to increased costs and independent value. Most often, the active ingredient would be wholly substituted or mislabeled.

Perhaps that's changed, but it seems far more likely that cheaper substitutes would be used (ephedrine, 'research chemicals', etc).