Nothing so far as legalizing heroin is being considered in the US, but Philadelphia is considering becoming the first US city to offer supervised injection sites [1] as a method of harm reduction, but there's a lot of understandable resistance to the idea.

Portugal has taken steps towards decriminalizing drug use and treating it as a health matter, and has had success so far [2]

[1] https://www.npr.org/sections/health-shots/2018/01/10/5767570...

[2] https://www.drugpolicy.org/sites/default/files/DPA_Fact_Shee...