The Portuguese government implemented this model of decriminalization in 2001: if someone is arrested with a small quantity of any illegal drug, they are not placed in handcuffs or sent to jail. Instead, that person receives a summons to appear at a panel with a lawyer, social worker, and psychiatrist.
Overall drug use has steadily decreased in Portugal over the last 16 years. Most importantly, this policy change has been a resounding success as a public health initiative.
We are witnessing other countries improve their drug policy while Congress and the Trump administration seem unwilling to display the political courage to change the status quo, or disentangle themselves from the special interests that are keeping Americans mired in addiction.