77 Pa. Stat. § 22d
In addition to those persons included within the definition of the word "employe" as defined in section 104, act of June 2, 1915 (P.L. 736), known as "The Pennsylvania Workmen's Compensation Act", reenacted and amended June 21, 1939 (P.L. 520), and amended February 28, 1956 (P.L. 1120), there shall be included all special school police in municipalities and townships, who shall be and are hereby declared to be "employes" of the appointing municipality or township for all the purposes of said act, and shall be entitled to receive compensation in case of injuries received while actually engaged as policemen or while participating in instruction or while answering any emergency call for any purpose or while performing any other duty authorized by the municipality or township.
The municipality or township as employer shall, in all cases, be deemed to have knowledge of all other employment of all members of its special school police, including self-employment, and shall be liable for compensation on account of all wages and earnings resulting therefrom. In all cases where an injury compensable under the provisions of this act is received by a member of the special school police who is, in whole or in part, a self-employer and loss of earnings results therefrom, such earnings shall, for the purposes of this act, be regarded as wages. The average weekly wage as so regarded shall be that most favorable to the employe, computed by dividing by thirteen the total earnings of the employe in the first, second, third or fourth period of thirteen consecutive calendar weeks in the fifty-two weeks immediately preceding the accident. In all cases where an injury compensable under the provisions of this act is received by a member of the special school police of a municipality or township, who is self-employed or unemployed, payments shall be made of not less than twenty-two dollars and fifty cents ($22.50) per week for total disability and not less than twelve dollars and fifty cents ($12.50) for partial disability.
77 P.S. § 22d