>I was wrong I just checked with someone and it is possible to have a blank judge code.

I asked a question two times and you ignored it both times so I'm going with my understanding of that condition. As Bo suggested, I would use NULL instaed of empty for parameters.

WHERE 
  -- judgecode is not empty 
  LEN(judgecode) > 0 
         AND ( @parameter IS NULL OR judgecode = @parameter)