Defensive pass interference in Football is when a defensive player, usually a defensive back, prevents an offensive receiver from catching a forward pass, usually by illegal means such as pushing, grabbing, or tripping. Defensive pass interference is when a defensive player interferes with an offensive player who has a legitimate chance at catching the football. If it is deemed that the offensive player couldn't have caught the ball before the interference occurred, the penalty is waived. Also, if the ball is interfered with in any way on the way to the receiver, such as being tipped at the line of scrimmage, pass interference is no longer possible and cannot be called. A defensive pass interference is a spot foul, wherein the offense is given the ball at the spot of the penalty.