body: I would like to read civil litigants constitutional challenges. Where would such filings be filed?
  
  
  I have read several appeal court and supreme court opinions on constitutional challenges on google scholar BUT where are the actual litigants filings filed?
  
  
  I have done a PACER search for the cases found on google and the docket for those cases do not show anything that can be construed as a constitutional challenge in that case docket. I have looked at 3 appeal court dockets which had an opinion on a party's constitutional challenge BUT there is no entry of anything that resembles a constitutional challenge filed in that appeal docket either.
  
  
  
title: legal research question