(a) Division of costs.--In every case of summary conviction in which the evidence is not sufficient to convict and the defendant is dismissed, there shall be no costs imposed if the prosecutor is a police officer engaged as such in the employ of this Commonwealth or of any of its political subdivisions. In all other cases, the costs may be imposed on the prosecutor or by the defendant if so permitted by law.

(b) Costs where default occurs.--In every case of summary conviction in which the defendant is convicted and sentenced to jail in default of the payment of the fine and costs imposed, the costs of prosecution shall be borne by the county.

(c) County of the second class.--In any case before a salaried magistrate where costs are borne by a county of the second class, the costs chargeable to the county shall be one-half of the costs set forth in section 1725.1(b) (relating to costs).