You read the DUI breath test strip from the top down. That strip along with the precautionary checklist are important to understand the breath test result and whether the machine was working properly. The DUI breath test strip is not generated from the portable field PAS breath test, but comes from the official testing equipment at the jail, police department, or can be in the field with a DUI Checkpoint.
A DUI breath test can be fairly accurate in Carlsbad arrests and all othe "drunk driving" arrests. The official test is usually given at the police station or Vista Jail in North County. The field breath machine is not as accurate. The breathalyzer is maintatined and caliberated by the San Diego Crime Lab and these records are available to attorneys. The Officer must be trained on the equipment and go through a checklist when administering a DUI breath test.