Keegan Bradley was penalized two shots on Sunday in the final round of the Arnold Palmer Invitational for brushing sand away from just off the green.
Under Rule 13-2 in the Rules of Golf, a player can brush away loose debris from the putting surface -- whether their ball is on the putting surface or not -- but cannot do so off of it, as it's considered improving a player's lie. A player cannot improve their lie, intended stance, the line of play or the area where they are about to drop the ball.
The loose impediment rule allows for players to move natural objects off the green, with the exception of sand and loose soil, which are only considered loose impediments on the putting surface.
Bradley made the mistake on the par-3 second hole, then called in a PGA Tour official for a ruling and accepted the accompanying penalty, leading to a double-bogey 5.