“State safety member” shall also include those persons while employed by the San Francisco Port Authority prior to their transfer to the San Francisco Port Commission whose principal duties consisted of active law enforcement and who were peace officers, as defined in former Section 830.35 of the Penal Code, as amended by Chapter 460 of the Statutes of 1979, but excluding any person whose principal duties did not clearly fall within the scope of active law enforcement even though the person is subject to occasional call, or is called upon occasionally, to perform

duties within the scope of active law enforcement.