No person must interfere with an aircraft which has been involved in an accident, the wreck or wreckage, a part or component thereof or anything transported therein or any marks resulting from the accident which may be of assistance in an investigation-
- until authorised to do so by the investigator-in-charge; and
- until, in the case of an aircraft which must be cleared by a customs officer, clearance has been issued or permission granted by such officer.