While we all need to be careful, even those in legal States, because you're only protected from the Fed if you are in compliance with all State Medical Laws for that State, there is one thing to note in the article.
This all began back in 2011, Obama was still allowing arrests right and left. That wouldn't stop for another 3 years, 2014 when the Cole Memo came out, followed by the budget amendment that keeps legal med users protected.
While it's still practical to be cautious this incident happened in an entirely different world as far as public and political perception of cannabis.