<P> In basketball, goaltending is the violation of interfering with the ball while it is on its way to the basket and it is (a) in a downward flight, (b) entirely above the rim and has the possibility of entering the basket, and (c) not touching the rim . In NCAA basketball, WNBA and NBA basketball, goaltending is also called if the ball has already touched the backboard while being above the height of the rim in its flight, regardless of whether it being in an upward or downward flight or whether it is directly above the rim . Goaltending in this context defines by exclusion what is considered a legal block of a field goal . In high school and NCAA basketball, goaltending is also called when a player interferes with a free throw at any time in its flight towards the basket . If goaltending is called for interference with a field goal, the shooting team is awarded the points for the field goal as if it had been made . In high school and NCAA basketball, if goaltending is called on a free throw, the shooting team is awarded one point and a technical foul is called against the offending player . </P> <P> Goaltending is commonly confused with the related violation of basket interference (also called offensive goaltending) which occurs during an attempted field goal when a player touches the basket, the rim, or the ball when it is on the rim or directly above it . Like goaltending, basket interference when committed by the defending team results in an award of points to the shooting team as if the attempted field goal had been made . </P> <P> FIBA rules allow a defender to block any shot that is over the rim and the ball is on its upward flight . </P>

When did goaltending become a rule in the nba