Deaths are falling, but are overall drug usage and overdose rates falling? Could this very well just be increased access and availability to Narcan, along with increased familiarity with the symptoms to get access to treatment quickly?
Without looking up data right now: yes
edit: whoever claimed my comment is inaccurate should look at the stats for Naxolene usage on opioid users (https://www.health.ny.gov/statistics/opioid/data/pdf/nys_jul...). In one (1) county, they administered Naxolene to over 6,000 users. With that information, arguing there is no correlation between the wide spread availability of reversal drugs and the drop in deaths is just.. wrong.