Jerome Bettis says the NFL has taken advantage of its players by not sharing with them all the information it had about the risk of concussions.

After viewing an innovation expo in Jerusalem that included a presentation from ElMindA, an Israeli neuro-technology company that can help the NFL diagnose concussions, Bettis said Monday that he was encouraged by the progress but still perplexed about how transparent the league has been over the years.

"The problem is we don't necessarily know all the things the league is doing. For instance, working with this company here, you don't know if they are working with them closely to try to help solve the problem," Bettis said. "You definitely feel as though you were taken advantage of in a way that you weren't given that information, and you always want to have the choice of knowing, and when that is taken away from you, you feel as though you were taken advantage of."