Raiders WLB Aaron Curry has left camp for a second opinion on his ailing knees. On the active/PUP list, Curry's knees haven't responded to stem-cell treatment. "He'll go down and we'll let him get basically a second opinion and see if we can't do something to get him better," was all coach Dennis Allen would say about the situation on Friday. It's sounding like Curry's season is in jeopardy. None of Curry's $3.5 million salary is guaranteed.