Thanks for clarifying, I agree 100% with what you said here AJ. In your previous post, it seemed you were implying there was a reagent which, unlike Mecke, would indicate a DXM/MDMA combo pill. For this very reason, I have started preaching at DS that all US users who are really concerned about fake or adulterated pills should avail themselves of the free labtesting program.
According to the data at ecstasydata, the last 6 months have seen a dramatic increase of MDMA pills with additional ingredients, and although the test reagents will still pick out most of the truly dangerous ones, I for one am interested in MDMA only in my pills. The state of the market has forced this user to lab-tested pill only.
I beleive that testing kits have been behind the adulteration trends in the US in the last few years - first DXM came into popularity because careless or overly-optimistic users of the Marquis test could be fooled, now the trend is to include some MDMA in the mix to fool Mecke.