The Circuits are split as to whether manifest disregard of the law is still a reason for vacating an arbitration award. While the Eighth Circuit, which includes Minnesota, has not exactly been consistent on this issue, it generally says it is not. The Second Circuit, on the other hand, which includes New York, says that it is. 

Thus, Brady and his team are actually better off in Giants territory than they would be in the land of the Vikings. This would certainly be a critical play for Brady to call given that the under-inflation rule appears to apply only to teams not players and carries only a $25,000 fine.