(1) Unless the contrary is proved, a document purporting to be a certificate issued, under section 117 shall be regarded a certificate duly issued under this Act.

(2) Where a certificate issued under section 117 is served on a defendant seven or more days before its production in court in proceedings under this Act, the certificate is, unless the contrary is proved, sufficient evidence of the facts averred in it.

(3) Where a certificate issued under section 117 is served on a defendant fourteen or more days before its production in court and the defendant does not, within seven days of the date of service, serve notice of objection in writing on the prosecutor, then the certificate is, unless the Court finds the defendant is unduly prejudiced by a failure to object, conclusive proof of the facts averred in it.