When preferred evidence of age is nonexistent and automatically convincing evidence
is not readily available (i.e., within 10 working days) other evidence of age must
be obtained. Several other types of records were studied in sufficient volume to judge
their accuracy, but no basis was found for including them as automatically convincing
evidence.
It is important that this policy be used only if automatically convincing evidence is not readily available, because studies have
consistently shown that the error rate for DB findings using a combination of documents
is twice as high as the error rate for automatically convincing evidence.