The Raiders have signed CB Chris Johnson who didn’t play a down last season for the St. Louis Rams.  He played in 13 games for the Rams in 2005 and he made 24 tackles, defensed 4 passes, forced a fumble and recovered a fumble.  He also returned 38 kickoffs that season for 857 yards (22.6 avg) with 1 TD return.  Look for the Raiders to use him in their nickel and dime packages if he makes the team.  He also will be insurance for Chris Carr as a kickoff returner.