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The NFL says it has "enhanced" its pat-down procedure for fans entering stadiums, and is warning fans it will take longer to get into arenas.
The league has asked all 32 teams to instruct stadium security to search fans from the ankles up for banned items such as alcohol and weapons. Previously, the search was from the waist up.
Last week, a man was arrested for using an illegal stun gun at Sunday night's Jets-Cowboys game.
NFL spokesman Brian McCarthy said Friday the "enhanced security procedures" are not a result of any specific threat, but the league is "always refining and improving" security.
The checks started at last week's season-opening games. The NFL says they will take longer, and encourages fans to arrive early.
"We encourage fans to come early, enjoy their tailgating tradition and be patient as they enter the stadium," McCarthy said.
One fan says it's not long before people get patted down at restaurants, clubs and everywhere else.
"Where are you going to go that you're not going to get patted down, then?" Renee Lockwood said. "What's the line? You can't pat everybody down everywhere."