A blood-alcohol sample shall not be released to the arrestee or his attorney without a court order. Upon presentation of a valid court order, the sample and a copy of the court order shall be picked up and transported to Scientific Services Bureau where the sample will be divided in half. One half of the sample shall be released to the representative of the private laboratory performing the analysis for the arrestee, and the other half shall be returned to the originating Station. All rules of evidence shall apply.