; (2) have a 15-digit numerical identification code that may be used for tax withholdings and for verifying an H–2A worker’s employment approval for agriculture specifically; (3) include a photograph on the front, and such other information as the Secretary determines necessary stored on a card containing microprocessors for data storage including, fingerprints, retinal scans, DNA, blood type, and facial recognition; (4) be eligible for replacement not more than once in a 5-year period; (5) include the start and end date of the period of approved stay of the H–2A worker and a statement that the H–2A worker is a seasonal worker; (6) have physical and electronic security features to prevent fraudulent uses or any misuse as determined by the Secretary; and (7) have the H–2A worker’s program identification number clearly visible. (o) Social security numbers An H–2A worker may not be issued a social security account number. In any case where such number would be necessary, the guestworker identification number issued by the Secretary of Agriculture shall be used. . 305. Effective date This title and the amendments made by this title shall take effect beginning on the date that is not more than 2 years after the date of enactment of this Act.