body: In the US, do notices like "except as required by federal, state or local law" in contracts have any purpose other than to serve as a reminder to the reader/party? 
  
  
  If something is required by federal, state or local law, then surely it overrides any contradicting clauses in the contract, so can these notices be omitted without change to the substance of a contract?
  
  
  
title: Is there any need for "except as required by law" notices?