How can you tease good science out from the muddled backgrounds of a homeless population? Do you expect these people to answer some perfect questionnaire 100% truthfully? No, the question big pharma is attempting to answer is "Will our pharmaceuticals kill people in some obvious way, in a short term time frame?". Nauseating.
One of the things that I found unusual was that homeless people will literally begin taking drugs in order to qualify for drug treatment trials. Meaning that they will take heroin in order to qualify for a heroin treatment program and get paid for their participation. That's some messed up stuff right there. A number of these big Pharma/Biotech companies are HQ'd here where I live. I wonder if they do these studies locally it if they don't like to "shit where they eat" so to speak?