Sample testing procedures enable electronic sample forwarding, retesting on request, and integrated laboratory reporting for customs clearance. Representative samples must be drawn under the proper officer's orders for testing or other verification; re testing requests by importers may be granted by senior commissioners as a facilitation measure. A CRCL module in the electronic customs system automates forwarding of test memos to CRCL and other revenue laboratories and the electronic receipt of test reports, while identified alternative laboratories may be used where CRCL lacks capability.