On July 28, a gunman who was apparently targeting the NFL killed four and seriously injured another before taking his own life. It could have been much worse.

Now, the NFL has taken steps to protect against further violence, specifically with the league’s 32 teams.

Via Sports Business Journal , TheAthletic.com recently obtained a memo from the league to all teams. The memo recommends three changes to security protocols.

First, the NFL suggests updated threat assessments at every team and league facility, in order to ensure that any risks are properly “identified and mitigated.”

Second, the NFL suggests the use of armed officers at all team and league facilities, whenever players or staff are present.

Third, the NFL suggests the teams employ “weapons screening” for anyone who enters

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