NFL strengthens gambling policy, reinstating players after revisions

Betting on NFL games now results in a minimum one-year suspension, with harsher penalties for betting on one's own team.
Reduced penalties for betting on other sports, down to two games for a first offense at team facilities.
Three players reinstated early under new policy: Jameson Williams, Nicholas Petit-Frere, and Stanley Berryhill.
Commissioner has discretion in determining penalties based on various factors like history and cooperation.
Stricter policy aims to maintain integrity of the game amid legalized sports betting.