Yes. I would like to say two things.
First, of course, we have the historical example of alcohol prohibition. We repealed prohibition. We regulate alcohol. It's worked a lot better.
The second thing I'd like to say is that we have lots of evidence to say that even if you take out the low-level dealer, the next day or the next week there will be another person in that position. Prohibition is not a sustainable exercise. Yes, you can take somebody off the streets temporarily, but others will fill that void. That's how the laws of supply and demand work.
The circumstance you've described is tragic. But mandatory minimum sentences will not prevent it from happening. Harsher prohibition will not prevent it from happening.