18 Pa. C.S. § 5718
When an investigative or law enforcement officer, while engaged in court authorized interceptions of wire, electronic or oral communications in the manner authorized herein, intercepts wire, electronic or oral communications relating to offenses other than those specified in the order of authorization, the contents thereof, and evidence derived therefrom, may be disclosed or used as provided in section 5717(a) (relating to investigative disclosure or use of contents of wire, electronic or oral communications or derivative evidence). Such contents and evidence may be disclosed in testimony under oath or affirmation in any criminal proceeding in any court of this Commonwealth or of another state or of the United States or before any state or Federal grand jury when authorized by a judge who finds on subsequent application that the contents were otherwise intercepted in accordance with the provisions of this subchapter. Such application shall be made as soon as practicable.
18 Pa.C.S. § 5718