BOSTON -- The NBA is investigating the allegations made by former referee Tim Donaghy, who states in his unpublished book that his former colleagues manipulated games and allowed friendships with coaches to dictate calls.

He also alleges that referees occasionally made wages on games and that some would make calls to help a team win in the playoffs so that the series would go longer and it would boost televesion ratings.

Celtics All-Star Ray Allen said that there were times in his illustrious career that he felt like referees were out to get him and/or the team he was on, but in the end, he says that there is a human element to the job which means that all referees will make mistakes at times.

"Referees' aren't always perfect," Allen said. "They are going to make some judgment calls. How they see certain things, it's all a perspective. I think the best thing that we as players can do is build a relationship with the referees."

Boston coach Doc Rivers said that the league shouldn't listen to Donaghy because he's a convicted criminal. Donaghy was sentenced to 15 months in prison for his participation in a gambling scandal.