prosecutor bruce castro declined to bring charges against cosby a decade ago and today he testified that that decision bars his successors from ever prosecuting could bey. that argument is part of cosby's attempt to get the charges against him thrown out. he was arrested in december, charged with drugging and sexually assaulting a former employee at temple university. we'll take you to today's developments in ten minutes. >>> turning to storm team 4 and our changing weather conditions. going to have us in weather alert mode tomorrow. >> dj, it's hard to believe that rain would be a concern in february. >> and it's not just of course the rain that's coming into the area. it's the snow melt and how much liquid equivalent is locked up in the snow that's still sitting on the ground. somewhere between one and two inches, especially north and west of d.c. where we do expect to see some of the more problematic areas. so we'll be on air throughout the day. giving you updates. make sure you tune in and download the news4 washington app. fog, rain, wind and even thunder with the storm system at ti