A significant rule change was made in 1981 whereby the NBA eliminated the ejection of a coach for three technical fouls caused by an illegal defense. Also, in the NBA ejections and suspensions are not permissible if a technical foul is caused by an excessive timeout, delay of game, accidental departure from the coach's box, the destruction of a backboard caused by a play (such as a dunk), defensive hanging on any part of the basket unit to successfully touch a ball (Rule 12), or any remaining in the game after six fouls when a team is out of players because of fouls, injuries, and ejections under Rule 3, Section I, paragraph b. These technical fouls are referenced in the NBA rule book as "Non-Unsportsmanlike Conduct Technical Fouls".