In any administrative hearing, a certificate of analysis of a chemist, performed in any laboratory operated by the Department of Forensic Science or authorized by such Department to conduct such analysis, when such certificate is attested by such chemist, shall be admissible as evidence. A copy of such certificate shall be delivered to the parties in interest at least seven days prior to the date fixed for the hearing.

Any certificate of analysis purporting to be signed by any chemist shall be admissible as evidence in such hearing without any proof of the seal or signature or of the official character of the chemist whose name is signed to it.