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SQL Conditional expressions in where clause

Conditional expressions in where clause: 
procedure get_demo_by_carrier_scope (pIsInterstateCarrier in char,pResultSet out sys_refcursor) AS
  BEGIN

   OPEN pResultSet FOR
      SELECT pc.dba_name,
             pc.cdbcustomerid,
             pt.type_name,
             pc.inter_intra_state
        FROM psp_customer pc
             JOIN psp_customer_types pt ON pt.typeid = pc.typeid
       WHERE (pIsInterstateCarrier ='A' OR pc.inter_intra_state =
                CASE
                   WHEN pIsInterstateCarrier = 'Y' THEN 'Interstate'
                   WHEN pIsInterstateCarrier = 'N' THEN 'Intrastate'
                END)
            AND (PC.TYPEID = 1 or pc.typeid = 2); -- MC and IAH only

  END get_demo_by_carrier_scope;;

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