Taller players tend to dominate basketball games because they have distinct advantages in scoring and playing defense. They're naturally closer to the hoop and their imposing height can be used to block shots and disrupt play around the basket. To level the playing field somewhat, the National Basketball Association instituted the three-second rule, which prohibits offensive players without the ball from camping under the basket for more than three seconds at a time. While once only an offensive violation, the three-second rule now may be called on defenses as well.
History
Prior to 2001, NBA rules prohibited zone defenses, meaning each defender had to match up one-on-one with an opponent. Double-teaming away from the ball or guarding a zone of the court as opposed to a specific man caused an illegal defense call, with a second such violation resulting in a technical foul and one free throw. However, in 2001, the NBA changed its rules to allow zone defenses. In doing so, the league created the need for a defensive three-second rule.
Features
A defensive three-second violation occurs when a defender remains in the free throw lane longer than three seconds without guarding an opponent. The restricted area in question includes the area under the basket that extends from the endline to the free throw line. As long as the defender is within an arm's length of an opponent, he can remain in the lane as long as he wants. If he's not guarding an opponent, the defender must leave the lane after three seconds. The three-second count restarts if the offensive team loses control of the ball. Officials will waive the count if the defender actively starts guarding a player or if the offensive team is in the act of shooting, allowing the defender to remain in position to rebound any missed shot.
Function
The defensive three-second rule prevents a dominant big man from controlling play under the basket. Without the rule, a tall center could simply stand under the hoop at all times, blocking shots and denying layups. The rule helps create offensive scoring chances and enhances overall play.
Penalty
Committing a defensive three-second rule violation results in a technical foul that is registered as a team foul. As a result, the offensive team receives one free throw and retains possession of the ball. The penalty is all but identical to the punishment for illegal defenses in years past.
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