You strike me as the type of person who doesn't know that US urban crime decreased in 2023.
The novel thing in world of illicit drugs is that fentanyl is very hard to dose correctly, so death rates are higher than before. That new fact on the scene makes long term comparisons difficult. But, I would say given the dropping crime rates of the last 40 years, we're doing better than the previous waves of "tough on crime" policy including drug wars from the 1980s and 1990s, despite incarcerating a lot fewer people. So I think these "experiments" absolutely are working. That effectiveness may however be overshadowed by the specific dangerousness of fentanyl in the illicit market.
The novel thing in world of illicit drugs is that fentanyl is very hard to dose correctly, so death rates are higher than before. That new fact on the scene makes long term comparisons difficult. But, I would say given the dropping crime rates of the last 40 years, we're doing better than the previous waves of "tough on crime" policy including drug wars from the 1980s and 1990s, despite incarcerating a lot fewer people. So I think these "experiments" absolutely are working. That effectiveness may however be overshadowed by the specific dangerousness of fentanyl in the illicit market.