NFL discipline can be tough to predict

Joey Porter's arrest raises an obvious question: What discipline might the Cardinals outside linebacker face from the NFL?

Porter had only been arrested as of Saturday. He had not been charged, let alone convicted.

But a conviction isn't always necessary for the NFL to mete out punishment.

The league suspended then-Seahawks defensive tackle Rocky Bernard for the 2008 regular-season opener even though a court never convicted him on a domestic-violence charge. Bernard agreed to undergo domestic-violence training as part of an agreement that can result in charges being dropped after two years.

The NFL did not suspend Seahawks linebackers Lofa Tatupu or Leroy Hill over DUI arrests last offseason.

In 2009, the San Diego Union-Tribune put together a list of 60 arrests involving NFL players. Quite a few never resulted in suspensions.