While building hype for the NFL season, which begins in two weeks, the league is also taking precautions against sports betting among its players, especially as the NBA and MLB have faced significant controversies this year.

The NFL will have investigators on-site during game days to scout for “suspicious activity,” according to ESPN. What constitutes suspicious activity is unclear, though SVP of NFL security Cathy Lanier told ESPN that the investigators, which consist of retired FBI agents or executive-level police officers, are searching for behavior that could be an “anomaly.”

The NFL’s security team also monitors betting markets in search of suspicious activity, such as large swings in the odds of player props.

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