Gov. Code, § 31646.1

A member who returns to active service following an uncompensated leave of absence on account of illness or injury arising out of and in the course of employment which exceeds 12 consecutive months and for which the member receives temporary disability benefits pursuant to the Labor Code during the absence may receive service credit for the full period in excess of 12 consecutive months during which the member received temporary disability benefits pursuant to the Labor Code upon the payment of the contributions which the member would have paid during that period, together with the interest which the contributions would have earned had they been on deposit, if the member was not absent, provided, that the member has rendered sufficient service, other than the service for which credit in excess of 12 consecutive months is to be purchased pursuant to this section, to meet the minimum service credit requirements for benefits. The contributions may be paid in a lump sum or may be paid on a monthly basis for a period of not more than the length of the period for which service credit is claimed.

This section shall not be operative in any county until such time as the board of supervisors shall, by resolution adopted by a majority vote, make this section applicable in the county.