Commonwealth Consolidated Regulations Commonwealth Consolidated RegulationsOn every taxation, the Taxing Officer shall allow all such costs, charges and expenses as appear to the Taxing Officer to have been necessary or proper for the attainment of justice or for maintaining or defending the rights of a party, but, except as against the party who incurred them, costs shall not be allowed which appear to the Taxing Officer to have been incurred or increased:
(a) through overcaution, negligence or mistake;
(b) by payment of special fees to counsel or special charges or expenses whether to witnesses or others; or
(c) by other unusual expenses.