<Tr> <Td> </Td> <Td> This section may require cleanup to meet Wikipedia's quality standards . No cleanup reason has been specified . Please help improve this section if you can . (October 2009) (Learn how and when to remove this template message) </Td> </Tr> <P> In NBA basketball, the officials must watch an instant replay of a potential buzzer beater to determine if the shot was released before time expired . Since 2002, the NBA has mandated installation of LED light strips on both the backboard and the scorer's table that illuminate when time expires, to assist with any potential review . </P> <P> Instant replay first came to NBA in the 2002--03 season . In Game 4 of the 2002 Western Conference Finals, Los Angeles Lakers forward Samaki Walker made a three - point field goal from the half court at the end of the second quarter . However, the replay showed that Walker's shot was late and that the ball was still in his hand when the clock expired . The use of instant replay was instituted afterward . </P> <P> Beginning with the 2007--08 season, replay also can be used in determining players being ejected from contests involving brawls or flagrant fouls . In the 2008--09 season, replay may also be used to correctly determine whether a scored field goal is worth two or three points . It may also be used to determine the correct number of free throws awarded for a missed field goal . It may also be used in cases where the game clock malfunctions and play continues to decide how much time to take off the clock . </P>

When did the nba start using instant replay