not necessary to resubmit the evidence. When necessary,
a fingerprint expert will testify in local court as to his findings.
Should a department have any special problems involving the
development or preservation of fingerprints at a crime scene, the
experts are available for suggestions. In connection with the Latent
Fingerprint Section there is maintained a general appearance file of
many confidence game operators. Searches in this file will be made
upon request. In furnishing data on a suspect, the agency should make
sure that complete descriptive data is sent in. Photographs and other
material on individuals who may be identical with those being sought
will be furnished to the interested departments.

During the years many persons have voluntarily submitted their
fingerprints to the Identification Division for possible use in the
case of an emergency. These cards are not filed with the criminal
fingerprints but are maintained separately. Such prints should be
taken on the standard fingerprint form entitled "Personal
Identification" (Form FD-353). No answer is given to Personal
Identification fingerprint cards.

The fingerprint records of the FBI Identification Division are used
liberally not only by police agencies to obtain previous fingerprint
histories and to ascertain whether persons arrested are wanted
elsewhere, but by prosecutors to whom the information from the
Bureau's files may prove to be valuable in connection with the
prosecution of a case. These records are likewise of frequent value to
the judge for his consideration in connection with the imposition of
sentence. Obviously, the ends of justice may be served most equitably
when the past fingerprint record of the person on trial can be made
known to the court, or information may be furnished to the effect that
the defendant is of hitherto unblemished reputation.

It should be emphasized that FBI identification records are for the
_OFFICIAL_ use of law enforcement and governmental agencies and misuse
of such records by disseminating them to unauthorized persons may
result in cancellation of FBI identification services.

CHAPTER II

_Types of Patterns and Their Interpretation_

_Types of patterns_

Fingerprints may be resolved into three large general groups of
patterns, each group bearing the same general characteristics or
family resemblance. The patterns may be further divided into
sub-groups by means of the smaller differences existin