The SCOTUS decision was decided with a 7-2 split authored by Sotomayor with only Thomas and Alito dissenting.
In the past, individuals with a conviction for a marijuana distribution crime would have faced deportation (unless in the rare instance that the non-citizen qualified for political asylum).
The decision has big implications for non-citizens charged with marijuana crimes such as possession with intent to distribute. For non-citizens charged with a crime it is important that your criminal defense attorney work with an immigration attorney to help you make decisions about whether to go to trial or accept a plea deal. Even when the client decides not to go to trial, the plea deal must be structured in a way to minimize the immigration consequences.
Read the decision in its entirety here -