The Pennsylvania Superior Court has held that prior inconsistent statements may be used substantively as well as for impeachment purposes.
Commonwealth v. Loar, 399 A.2d 1110 (Pa. Super. Ct.), allocatur denied (1979).
Stephanie G. Spaulding,
Evidence - Hearsay - Prior Inconsistent Statements,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol18/iss2/9