can you knee a ball back to the goalkeeper
Back-pass rule While not an infringement of the back-pass rule, players are also prohibited from using a deliberate trick to pass the ball to the goalkeeper with a part of the body other than the foot to circumvent the rule. This would include, but not be limited to:
Touchback In standard outdoor American football, the team awarded the touchback receives possession of the ball at its own 25-yard line in college football, and the 25 yard-line for professional football, on kickoffs and free kicks after a safety as of the 2012 season. In arena football, and other indoor football games, a touchback results in the team awarded the touchback receiving the football at its own 3-yard line. This can result from any of the above events except for punting, which is not a part of arena football. (In arena football, a kicked ball usually bounces back into play off of the rebound nets, but the above can still occur when the ball lands in the slack nets behind the goalposts after a kickoff, passes under the rebound nets and out of play, or in the event of fumbles and interceptions.)