On Wednesday, multiple reports emerged that the Buffalo Bills were one of eight teams who have had their Infectious Disease Emergency Response (IDER) plan approved. In order for players to be allowed into the team facility, the team needed to have the IDER plan in place.
IDER plans are what to do in the case of an outbreak within the team. With close contact frequent among players, the possibility of an outbreak is higher than in other sports or workplaces, requiring the more extensive plan.
The individual team plans were all approved by the NFL earlier this week, but they had to pass muster with the NFLPA, as well.