https://www.mlb.com/bluejays/ballpark/information/guest-code-of-conduct
Foul Balls, Homerun Balls & Bats
During the game, fans must stay in their seats except when travelling to concessions, restrooms, or for emergencies and fan services support.
All guests are asked to stay alert throughout the game for foul balls or bats that might leave the playing area. Guests are permitted to keep any foul and home run balls that are hit into the seats, but are asked to be cautious and courteous to others when collecting a ball. Bats entering the stands must be returned if requested by the Blue Jays or visiting team. Guests are prohibited from throwing balls back onto the field. Violators are subject to ejection and possible arrest. Any guest that interferes with a ball in play or the game in any way is subject to ejection from the ballpark and/or criminal prosecution.