The county engineer must be a registered professional engineer or engineering firm qualified to do business in this state. This does not apply to any county engineer who:

   (1) Was employed on or before June 30, 1967;

   (2) Was employed on less than a full-time basis; and

   (3) Was not employed to furnish professional engineering advice on road programs in the county.

s. 43, ch. 29965, 1955; s. 26, ch. 63-572; ss. 1, 2, ch.