Veteran NBA reporter Peter Vecsey (h/t Michael Cunningham of the Atlanta Journal-Constitution) broke the news. Police records obtained by the Shelter Island Reporter (h/t Yahoo Sports' Ben Rohrbach) confirmed the arrest and noted Plumlee "posted $100 cash bail" after the arrest.
"We are aware of the situation involving Miles," the Hawks said in a statement, via Cunningham. "We are in the process of gathering more information and will have no further comment at this time."
Rohrbach explained the NBA's collective bargaining agreement still features marijuana on its list of banned substances, meaning players face the marijuana treatment program after a first violation. According to Rohrbach, a second violation can lead to a $25,000 fine, while a third can lead to a five-game suspension.