2006 New York Code - Certification Of A Check.

 
  Section. 3--411. Certification of a Check.
    (1)  Certification  of  a check is acceptance. Where a holder procures
  certification the drawer and all prior indorsers are discharged.
    (2) Unless otherwise agreed a bank has  no  obligation  to  certify  a
  check.
    (3)  A bank may certify a check before returning it for lack of proper
  indorsement. If it does so the drawer is discharged.