I would say that the NL model of decrimilisation without legalisation doesn't work. Largely because of it NL has a big gang problem, and one of the highest murder rates in Europe. Now fully legalise drugs, give them out for free for all that I care, that's the only way to kill the organised crime around it.

I would also be interested in which drugs you believe are worth decriminalising and which ones you deem to dangerous. There are generally a lot of misconceptions about the health effects of (especially hard) drugs in particular compared to some legalised ones (alcohol has extremely strong health effects).