Illegal defense
Encyclopedia
Defensive three-second violation, also known as illegal defense, is a rule violation in the National Basketball Association
National Basketball Association
The National Basketball Association is the pre-eminent men's professional basketball league in North America. It consists of thirty franchised member clubs, of which twenty-nine are located in the United States and one in Canada...

. It is assessed when a member of the defending team spends more than three seconds in the free throw lane (also known as the 16-foot lane, or colloquially as "in the paint") while not actively guarding an opponent. To be considered actively guarding, a defender must be within arm's length of an opponent and in a guarding position. A three second count is suspended if:
  • a player is in the act of shooting

  • there is a loss of team control

  • the defender is actively guarding an opponent

  • the defender clears the painted area

  • it is imminent the defender will become legal


In addition, a player guarding an opponent with the ball may be in the paint without actively guarding the opponent.

The team committing a defensive three-second violation is assessed a team technical foul
Technical foul
In basketball, a technical foul is any infraction of the rules penalized as a foul which does not involve physical contact during the course of play between players on the court, or is a foul by a non-player. The most common technical foul is for unsportsmanlike conduct...

. The offense will receive one free throw and retains possession of the ball.

Previously, any form of zone defense
Zone defense
Zone defense is a type of defense, used in team sports, which is the alternative to man-to-man defense; instead of each player guarding a corresponding player on the other team, each defensive player is given an area known as a "zone" to cover....

was considered an illegal defense violation and resulted in a warning on the first violation and then a technical free throw for any subsequent violations. In the spring of 2001 the rule was changed to its current form as part of an initiative to speed up play in the NBA. The high school and college game do not use this rule.
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