16 Pa. Stat. § 5171
The board of commissioners, when they deem the same expedient, may offer such reward, in addition to that authorized by law, as in their judgment the nature of the case requires, for the detection or apprehension of any person charged with or perpetrating any felony or misdemeanor, or aiding or abetting the same. Upon the conviction of such person, the county commissioners may pay such reward out of the county treasury, but in no case shall the owner of any stolen property be entitled to any of the reward for the detection or apprehension of the person guilty of the larceny. In cases of misdemeanor, the county commissioners must have the approval of the president judge of the court of common pleas of the county before offering or paying such reward.
16 P.S. § 5171