NFL Commissioner Roger Goodell sent a memo Friday threatening "significant discipline" for teams that do not abide by the league's alcohol policy. The memo follows Tennessee Titans offensive coordinator Todd Downing's early Friday morning arrest on DUI and speeding charges following the Titans' 27-17 road win over the Green Bay Packers.

Tom Pelissero and Ian Rapoport of NFL Network relayed the news and memo, which reminded teams that they could not have alcohol in locker rooms, team facilities and modes of transportation such as airplanes and buses.

After the Titans returned from Green Bay, Downing was charged with DUI and speeding in Williamson County, Tennessee, per the sheriff's department.