Records, reports, statements or data compilations, in any form, of public officials or agencies are not inadmissible under the hearsay rule if they set forth:
1. The activities of the official or agency;
2. Matters observed pursuant to duty imposed by law; or
3. In civil cases and against the State in criminal cases, factual findings resulting from an investigation made pursuant to authority granted by law,
Ê unless the sources of information or the method or circumstances of the investigation indicate lack of trustworthiness.