decriminalization
noun /diːˌkrɪmɪnəlaɪˈzeɪʃn/
  /diːˌkrɪmɪnələˈzeɪʃn/
(British English also decriminalisation)
 [uncountable]- the act of changing the law so that something is no longer a crime
- the proposed decriminalization of certain types of drugs