Limitation on number of school service personnel positions to be held by an employee

(a) Upon the effective date of this section, no school service personnel shall be permitted to become employed in more than one regular full-day position, nor more than two one-half day positions at the same time: Provided, That nothing herein shall be construed to prohibit a school service personnel from holding an extracurricular assignment or assignments, as provided in section sixteen of this article, or summer positions, as provided in section thirty-nine, article five, chapter eighteen of this code, nor from performing extra-duty assignments, as provided in section eight-b of this article, in addition to his or her regular position. (b) Due to the shortages of substitutes in service personnel positions, a service personnel may substitute on a day-to-day basis in a position outside of their regular full-time position: Provided, That a service personnel may not substitute in another position if: (a) A qualified substitute is available to fill the shift; (b) The shift interferes with their regular duties and or responsibilities; and (c) The service personnel assuming the shift is not properly certified and trained for that position.