From a New York Times story by Jenny Vrentas headlined “An N.F.L. Stadium Brings Sports Betting Inside”:

The doors to the sports book at FedEx Field opened two hours before the Washington Commanders’ first game of the N.F.L. regular season, drawing fans in with air-conditioning that blasted onto the stadium’s main concourse. Signs advertised a free Commanders hat for anyone who bet $20. A bouncer stood out front with a hand-held device that scanned IDs to check that patrons were 21 or older and not barred from gambling by state regulators.