is placed back at the spot of the fumble. A defensive player can recover and advance at any time of play. Enacted in 1979 in response to the 1978 "Holy Roller" play that resulted in a last-minute game-winning touchdown over San Diego, in which Oakland Raiders quarterback Stabler fumbled the ball forward, and tight end Dave Casper eventually performed a soccer-like dribble before falling on it in the end zone. Lester Hayes rule: No Stickum allowed. Enacted in 1981 in response to the Oakland Raiders defensive back, who used the sticky substance to improve his grip. Lou Groza rule: No artificial medium to assist in the execution of a kick. Enacted in 1956 in response to Groza, who used tape and later a special tee with a long tail to help him guide his foot to the center spot of the football. Mel Blount rule: Officially known as illegal contact downfield, defensive backs can only make contact with receivers within five yards of the line of scrimmage. Enacted in its current form in 1978. While playing for the Pittsburgh Steelers, defensive back Blount frequently used physical play against receivers he was covering. Mel Renfro rule: Allows a second player on the offense to catch a tipped ball, without a defender subsequently touching it. Enacted in 1978. One of the first high-profile "victims" of the old rule was Dallas Cowboys defensive back Renfro in Super Bowl V; his tip of a pass allowed the Baltimore Colts' John Mackey to legally catch the ball and run in for a 75-yard touchdown. NaVorro Bowman rule: Enacted in 2014, this rule subjects plays in which a loose ball has been recovered to instant replay. Named for Bowman, who during an incident in the previous season's NFC Championship Game recovered a fumble after the officials had blown the play dead. Neil Smith rule: Prevents a defensive lineman from flinching to induce a false start penalty on the offense. Enacted in 1998. Smith had frequently used that technique while playing for both the Kansas City Chiefs and the Denver Broncos. Odell Beckham Jr. rule: Any player who accumulates two unsportsmanlike conduct penalties in a game is automatically ejected. The original draft of the proposed rule would have counted any two personal fouls toward ejection and drew its name from Beckham, who committed three personal fouls during a game in the 2015 season. The rule, as enacted