NFL officials warn players to stay legal more than you think. But some infractions demand a flag, not a warning.
Here's what I'm watching for from the Super Bowl LIII officials.
 Preventative officiating happens every game and at every level and at every sport. It helps fans enjoy the game without a foul-fest.
Dean Blandino, the NFL vice president of officiating, released his weekly media tape discussing the calls of the previous week (video download). First, Blandino addressed the...