16 Pa. Stat. § 446
The commissioners of any county may join associations and organizations concerned with county or governmental affairs, other than the County Commissioners Association of Pennsylvania, may pay dues to such associations and organizations and may send delegates to meetings or conferences of such associations and organizations and pay the necessary expenses incident to their attendance at such meetings or conferences.
The county commissioners of any county may authorize any county official and employes of the official to attend meetings of professional associations and organizations, or study or training sessions for persons holding the same or similar office or employment, and may pay all or any specified portion of the necessary expenses incident to their attendance at such meetings or sessions.
Every person attending any conference, meeting or study or training session referred to in this act shall submit to the controller, or to the county commissioners in counties having no controller, an itemized account of expenses related to the event, including traveling expenses or mileage, which the county commissioners may have agreed to pay.
16 P.S. § 446