“Our major concern is that if you start decriminalizing these substances prior to developing a strong evidence base for their efficacy, it undermines efforts to do research. We’ve seen that with cannabis: state decriminalization and widespread availability and access to cannabis has made it difficult to do rigorous clinical trials.”

How does decriminalization undermine research efforts or make it difficult to do rigorous clinical trials? I’m drawing a blank trying to imagine answers to this.

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