Kevin Patra:NFL moves extra point to 15-yard line for 2015 season.National Football League (NFL),19.Mai 2015,abgerufen am 5.Februar 2019(amerikanisches Englisch,Aktualisiert am 20. Mai 2015):„According to the rule change, if the defense returns a blocked extra point or failed two-point try for a touchdown (i.e. on an interception), they will be awarded two points. Under the previous rule the ball was dead on a failed try.“