There are several reports saying that Quinnen Williams was arrested for trying to board a plane with a gun. See the tweets below for more information. The gun laws are certainly very different in New York than they are in Alabama. That being said there is absolutely no excuse for this and Quinnen could now face discipline by the league.
There will be more information on Quinnen Williams arrest in our forums.
Port Authority police have clarified that Quinnen Williams was arrested for carrying a Glock 19 pistol. It's unclear whether the handgun was loaded.