coming in to the stadium, including katy perry's halftime show materials. even with heightened security measures in place, officials say the key to keeping the big game safe is public vigilance. in los angeles, abc news. back to you, reena and t.j. >> thank you. given the whole deflate-gate controversy, the nfl says there will be extra security for the balls that will be used on sunday. the patriots and seahawks have been practicing with 108 footballs, all of which they will turn over to the league today. they will be held until three hours before game time when officials will test them. at that point the balls will be held until just before kickoff. then they will be given to the ball boys. >> we have to put the balls under strict security. >> the balls will get more security than the people coming in. >> isn't that something? this is where we are now. this probably should have been done all along but given the scrutiny this game will get it is the right thing to do. for pr purposes if nothing else. i'm done. >> are you sure?