I wouldn't agree that your evidence base is replaced with anecdotes (not sure what you mean by SWIM), rather since the drug has been outlawed, all you have left

I wouldn't agree that your evidence base is replaced with anecdotes (not sure what you mean by SWIM), rather since the drug has been outlawed, all you have left are anecdotes. People will use and describe the effects of drugs with or without the law's discretion, and I would imagine the decriminalization-party should be thankful for the experimentations.