Interesting analysis, but completely disagree with your conclusion.
You seem to basing your conclusion on an assumption that drugs are inherently bad. Without any further context, that could lead to your conclusion that “It’s obvious that more barriers need to be put in place in order to prevent people from getting their hands on these substances”. However, we already know that doesn’t work. Maybe what we need is to legalize drugs and educate people about their use?
Maybe you could look into some data sets of drug usage in places like Portugal.