Section 3--406. Negligence Contributing to Alteration or Unauthorized Signature  


Latest version.
  • Any person who  by  his  negligence  substantially  contributes  to  a
      material   alteration   of  the  instrument  or  to  the  making  of  an
      unauthorized signature is precluded from  asserting  the  alteration  or
      lack  of authority against a holder in due course or against a drawee or
      other payor who pays the instrument in good faith and in accordance with
      the reasonable commercial standards of the drawee's or payor's business.