Plummer is one of several athletes who teamed up with Realm of Caring to raise $100,000 to study cannabis' effects on pain and brain injuries in current and former players. Monroe, who was expected to sign with the Giants before he announced his retirement, contributed $80,000 for the study that may involve more than 100 current players this season. The goal of campaign -- dubbed "When the Bright Lights Fade" -- is to eventually secure enough funding for studies on CBD's potential in preventing or minimizing CTE.