This is why you should be skeptical of what you hear from other people. Cocaine and heroin are expensive, especially if you wanted to sell doses for human consumption. If someone wanted to press bunk or low quality pills there are vastly more economical alternatives than coke or heroin. It seems to me you'd have to be a lucky son of a bitch to get an 'ecstasy' tablet 'laced' with LSD.

Take a look at ecstasydata.org which has tested over 1,500 pills in the past decade. Of those five tablets contained any cocaine and one heroin.