The Science of Fingerprints: Classification and UsesUnited States. Federal Bureau of Investigation
Science
The Science of Fingerprints: Classification and Uses
United States. Federal Bureau of Investigation
Fingerprints
Excessive perspiration can be controlled to some extent by the
identification officer. Excessive perspiration causes the inked
impressions to be indistinct. It is suggested in these cases to wipe
the finger with a cloth and then immediately ink the finger and roll
it on the fingerprint card. This process should be followed with each
finger. It is also suggested that possibly the fingers could be wiped
with alcohol, benzine, or similar fluid which would act as a drying
agent.
In all the above situations, if it is not possible to accurately
classify and file the fingerprint card, the name appearing on the card
will be searched in the alphabetical files and then returned to the
law-enforcement agency.
_Permanent disabilities_
Another phase involves permanent disabilities which can in most cases
be controlled by the identification officer. These can be lack of
fingers (born without), amputations, crippled fingers (bent, broken),
deformities (webbed, extra fingers), and old age.
With respect to lack of fingers, it should be noted that some
individuals are born without certain fingers. The notation "missing"
is not satisfactory because it does not sufficiently explain the
correct situation. It is suggested that "missing at birth" or some
similar notation be made in the individual fingerprint block on the
card. A proper notation concerning this situation will prevent the
fingerprint card from being returned. Figures 378 and 379 illustrate
temporary and permanent disabilities.
[Illustration: 378. Temporary disability.]
[Illustration: 379. Permanent disability.]
Concerning amputations, it is suggested that a proper notation to this
effect appear in the individual fingerprint block or blocks. It is
suggested that if a portion of the first joint of a finger is
amputated, the finger should be inked and printed. A notation
concerning this fact should be made on the fingerprint card in the
individual fingerprint block.
In those cases where all of the fingers are amputated, the inked
footprints should be obtained.
The handling of crippled fingers and certain deformities can be
discussed in a group because they generally present the same problems.
It is not sufficient in all cases to indicate "broken," "bent,"
"crippled." If the fingers are bent or crippled so that they are
touching the palm and cannot be moved, a notation to this effect
should be on the fingerprint card in the proper individual fingerprint
block. However, it is believed that these extreme cases are rare. It
is suggested that the special inking devices used for taking the
prints of deceased individuals be used in taking inked impressions of
bent or crippled fingers.
[Illustration: 380. The spatula, roller, and curved holder used for
taking the inked prints of bent or crippled fingers.]
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