is decriminalization of some drugs a state or federal issue?

It can be both a state and federal issue. States have the authority to decriminalize drugs within their own borders, but federal drug laws still prohibit the possession and distribution of certain substances. Some states have already decriminalized or legalized certain drugs, such as marijuana, while others have stricter laws in place. Federal law can sometimes conflict with state laws, creating a complex legal landscape for drug policy in the United States.