1. Blocking
1.1 Screen blocking is the only permissible form of blocking and is only legal on or behind the line of scrimmage.
1.2 Screen blocking is defined as legally obstructing an opponent without contacting him/her with any part of the body.
1.3  While screen blocking the player must keep his/her hands to the side or behind the back with both feet on the ground. Any use of the hands, arms, elbows, legs or body to initiate contact during an offensive player’s screen block is illegal. Penalty:  Personal foul.
1.4  A blocker shall not:
b. When he/she is behind a stationary opponent, take a position closer than a normal step from him/her.
c. Take a position so close to a moving opponent that this cannot avoid contact by stopping or changing directions.
d. After assuming his/her legal screening position, move to maintain it, unless he/she moves in the same direction and path of his/her opponent.
1.5 If contact is made flush into the body the foul will be against defense.
1.6 If contact is made on the side of the body the foul will be against the offense.