What should be used if the date of birth (DOB) is unknown at the time of the test?

The use of the test date is appropriate when the date of birth (DOB) is unknown at the time of the test because it provides a timestamp relevant to the test itself. This date can be important for record-keeping and ensuring that the results are contextualized against a known timeline of events. Utilizing the test date ensures that the report reflects the date on which the breath test was administered, thereby maintaining clarity and continuity in the testing process.

Using the officer’s birth date or a default value like 01/01/1900 could result in inaccuracies that do not appropriately represent the individual being tested and may lead to complications in interpreting the test results. The subject's last known DOB could also be misleading if that information is outdated or inaccurate. Therefore, employing the test date is the most reliable and appropriate method in the absence of a known DOB.