Breaking NEWz you can UzE...
compiled by Jon Stimac
Civilians to Handle Evidence –
CAY COMPASS, CAYMAN ISLANDS
- Apr 25, 2007 ...Cayman Islands Police plans to replace
police officers with civilian workers involved the collection and
processing of crime scene evidence...
Fingerprints Trap 218 Criminals –
NEWS24, So AFRICA - Apr 23,
2007 ...Police caught 218 careless criminals
who left their fingerprints at crime scenes countrywide during the
past month. ...
Fingerprint Work Floods State Police
JOURNAL GAZETTE, IN
2007 ...state law now requires nearly everyone who works
with children or endangered adults submit to a fingerprint-based
criminal history check...
Some Prints on Murder Weapon Don't Match Defendant's
– DETROIT FREE
- Apr 18, 2007
...other fingerprints existed on the flashlight that was used to kill
a man besides those of the suspect...
Recent CLPEX Posting Activity
containing new posts
Moderated by Steve Everist
The CSI's conundrum of the day
David Fairhurst 16 Sun Apr 29, 2007 10:56 am
Interesting Tidbit 2
Charles Parker 20 Sun Apr 29, 2007 10:39 am
WANTED - CRIMCON MK-II CAMERA(S)
CDANIELS 53 Fri Apr 27, 2007 7:32 pm
Online fingerprint chat
Deuby 104 Fri Apr 27, 2007 1:24 pm
Epic Struggle -- Science versus Dogma
Pat A. Wertheim 777 Thu Apr 26, 2007 4:31 pm
Statistics and Misidentifications - The weeks Detail
Michele Triplett 2874 Thu Apr 26, 2007 1:42 pm
Iain McKie 282 Thu Apr 26, 2007 1:16 pm
JJ 240 Thu Apr 26, 2007 2:16 am
How many is enough?
EmmaC 258 Tue Apr 24, 2007 8:05 pm
Stephany Louk-Denney 483 Mon Apr 23, 2007 5:08 pm
UPDATES ON CLPEX.com
updates on the website this week.
Joe Polski brought us the IAI April Update.
we continue this series
with a patent involving radioactive latent print development.
Patent - Radioactive Latent
Authored by Charles Koch
1. Method for rendering fingerprint(s) visible by subjecting or exposing the
surface of the substrate presumably bearing the fingerprint(s), or at least
a corresponding region of said surface, to a fuming agent, under adapted
conditions, characterized in that said fuming agent consists of an agent
able to react with substances of the fingerprints and labelled with a
radioactive isotope able to mark a film-like material coated or impregnated
with an adapted reactive substance, and in that said method also consists in
then placing a portion of such a film-like material in a close position to
said surface or surface region and, possibly, submitting said exposed
portion of said film-like material to a developing or visualisation process.
2. Method according to claim 1, characterized in that the fuming agent is a
cyanoacrylate based agent.
3. Method according to claim 1, characterized in that said film-like
material comprises a photographic film.
4. Method according to claim 1, characterized in that said radioactive
isotope is .sup.14C.
5. Method according to claim 6, characterized in that said fuming agent is
prepared in such a way that some one of its elements are substituted by
their radioactive isotope.
6. Method according to claim 5, characterized in that said fuming agent is
radio labelled with radioactive .sup.14C.
7. Method according to claim 1, characterized in that said fuming agent is
able to react with fatty substances and/or amino acids and/or riboflavin of
8. Method according to claim 1, characterized in that said film-like
material is brought into close contact with the surface or surface region
bearing the fingerprint(s), during a given exposure time.
9. Use of radioactively-labelled cyanoacrylate as a fuming agent in a method
for rendering fingerprints visible, in connection with a film-like imaging
10. Use according to claim 9, characterized in that the radioactive label is
CROSS REFERENCE TO RELATED APPLICATION
 This application is a continuation application of and claims the
benefit under 35 U.S.C. 35 and 363 of International Patent Application No.
PCT/EP03/50663 filed on Sep. 26, 2003 designating the United States, the
entire contents of which are incorporated herein by reference in their
FIELD OF THE INVENTION
 The present invention is related to investigation and evidence
collecting techniques in connection with fingerprints, and concerns a method
for rendering fingerprints visible, especially on uneven and discontinuous
BACKGROUND OF THE INVENTION
 In spite of modern developments in forensic science involving DNA
fingerprinting and the analysis of other human traces, the conventional
fingerprint remains the main tool for linking a suspect to the scene of a
crime or for identifying with a high certainty the perpetrator of a crime.
 Various techniques have been developed for rendering fingerprints
visible, enabling them to be recorded photographically. On a flat smooth
solid surface, such as a pane of glass or a metal plate, this is relatively
easily performed using a fine powder which can be coloring or fluorescent.
 A known alternative method is to use cyanoacrylate as a fuming agent
(see for example U.S. Pat. No. 4,297,383). Under the correct conditions of
temperature and humidity, this agent reacts with the fats left behind in the
impression of the fingerprint, to form a polymer. This latter can then be
made visible by dusting with a powder or by the use of certain fluorescent
dyes. This again works very efficiently with a flat solid surface.
 However, difficulties are encountered in the case of uneven or
fibrous surfaces such as paper and cloth, because dusting or dying of the
latent fingerprint is hindered by the open porous nature of the surface.
 This marking operation can be done with some difficulty on paper. But
there is no effective solution at the moment for developing fingerprint
images on cloth.
 If this was possible it would represent a major advance in the
investigation and resolution of serious crimes such as murder and assault
where contact with clothing is often involved.
 GB 1,540,147 describes a method for developing latent fingerprints,
wherein the surface presumably bearing the fingerprints is contacted with a
reagent comprising small particles associated with a surfactant. In one
embodiment, the small particles may comprise particulate silver to allow
subsequent intensification of the prints by combination with radioactive
elements (e.g. .sup.35S) to produce autoradiographs. Alternatively, the
small particles associated with the surfactant may be radioactive powder.
 U.S. Pat. No. 5,194,289 relates to a method for labelling an object,
for its identification. A selected person's fingerprint is applied to an
object to be identified, at a predetermined location. Next, the
predetermined location is exposed to a vaporous agent comprising vapour of a
cyanoacrylate ester. Either the fingerprint or the cyanoacrylate ester bears
a detectable amount of an UV sensitive dye. The vaporous agent creates a
permanent impression of the fingerprints on the object, which impression is
perceptible only in presence of wavelengths of appropriate energy.
 The aim of the present invention is to overcome the afore mentioned
limitation and to propose a solution enabling good fingerprint rendering on
various materials and surfaces, especially on uneven and discontinuous
substrates such as paper, fabric and clothing material.
SUMMARY OF THE INVENTION
 To achieve this goal the present invention concerns a method for
rendering fingerprint(s) visible by subjecting or exposing the surface of
the substrate presumably bearing the fingerprint(s), or at least a
corresponding region of said surface, to a fuming agent, under adapted
 The inventive method is mainly characterized in that said fuming
agent consists of an agent able to react with substances of the fingerprints
and labelled with a radioactive isotope able to mark a film-like material
coated or impregnated with an adapted reactive substance, and in that said
method also consists in placing a portion of such a film-like material in a
close position to said surface or surface region and, possibly, submitting
said exposed portion of said film-like material to a developing or
visualisation process. Said latter step is not required if the film material
is self developing.
 The size of the used film-like material will be of course equivalent
to the area of the substrate with suspected fingerprints.
 According to a preferred embodiment of the invention, the fuming
agent is a cyanoacrylate based agent labelled with a radioactive isotope and
said film-like material comprises advantageously a photographic film, said
latter being for example usually available film material.
 Although many radioactive isotopes could be used a natural harmless
isotope such as radioactive .sup.14C is preferred.
 It is to be noted that the present method may be generally
implemented with a fuming agent that is labelled with a radioactive isotope.
The radioactive labelling of the fuming agent is preferably done by
substitution of at least one element of the fuming agent by a radioactive
isotope. The fuming agent is thus essentially unaltered and is capable of
marking a film-like material (e.g. photographic film).
 Alternatively, the radio labelling could be done by addition, i.e. by
adding to the molecule of the fuming agent a radioactive group or element.
 In order to obtain a high resolution in terms of reproduction of the
fingerprint(s) details beared by the analysed surface of the substrate, said
material is advantageously brought into close or intimate contact with the
surface or surface region bearing the fingerprint(s), during a given
exposure time depending on the used film-like material.
 Thus, according to a preferred materialisation of the inventive
method, said latter proposes to label cyanoacrylate with radioactive
.sup.14C, and to use this labelled cyanoacrylate as a fuming agent for
fingerprints on difficult substrates. This eliminates the step of developing
the latent fingerprint(s) with soot or dyes, since said latent fingerprint(s)
can then be imaged directly by placing a photographic film in close contact
with the substrate.
 Although cyanoacrylate based agents are preferred, other types of
molecules able to react with the substances of the fingerprints may also be
used, as long as they are adapted to the fuming procedure.
 Furthermore, it will be appreciated that the present method may be
generally implemented with any fuming agent that is able to react with at
least one of the substances contained in the fingerprints, in particular
with fatty substances and/or amino acids and/or riboflavin, and that is
adapted to the fuming procedure.
 The method can also be applied to the imaging of fingerprints on
curved or irregular surfaces.
 The present invention also concerns the use of radioactively-labelled
cyanoacrylate as a fuming agent in a method for rendering fingerprints
visible, in connection with a film-like imaging material, especially within
the context of the before described method.
 Preferably, the radioactive labelling additive is .sup.14C.
 The present invention is, of course, not limited to the preferred
embodiments described and represented herein, changes can be made or
equivalents used without departing from the scope of the invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
 A preferred embodiment of the method in according with the invention
will now be described in detail, by way of example, wherein the fuming agent
is a cyanoacrylate based agent radio labelled with .sup.14C.
 In order to reveal fingerprints, the surface of a substrate
presumably bearing the fingerprint(s) is subjected to the fuming agent. This
is typically done by fuming the substrate with vapours of the fuming agent.
The fuming agent deposits onto the substrate and reacts with the with the
fatty substances of the fingerprints.
 According to the present embodiment, the fuming agent is a
cyanoacrylate based agent that is radio labelled with radioactive .sup.14C.
 After subjecting the substrate to the fuming agent, a film-like
material is placed closed to or in contact with the surface onto which the
fuming agent has been applied, during a given exposure time. The activity of
the .sup.14C included in the fuming agent molecules will cause the marking
the film-like material and thus form an image of the fingerprints on the
film-like material. If required, the exposed film-like material is then
subjected to a developing or visualisation operation.
 As mentioned, the surface of a substrate presumably bearing the
fingerprint(s) is subjected to vapours of the fuming agent, i.e. the
.sup.14C labelled cyanoacrylate based agent. This is typically done by
fuming the substrate in a fuming vessel (or fuming cupboard) under
controlled conditions of temperature and humidity. Typically, for
cyanoacrylate the evaporation temperature is 130.degree. C. and the relative
humidity is about 60%. Samples are hung in the fuming vessel for various
times depending on their form and surface area. Commercially available
fuming vessels can be used to implement the present method. An advantage of
employing a .sup.14C radio labelled cyanoacrylate based fuming agent is that
it allows to implement the present method with standard equipment and that
fuming can be carried out under conditions similar to those used with a
conventional cyanoacrylate fuming agent.
 Regarding now the labelling of the cyanoacrylate based agent, this is
typically carried out by substitution during the synthesis of the fuming
agent. This is preferably done by replacing some of the elements of the
cyanoacrylate based agent by radioactive isotopes of the same elements. In
the present embodiment, the synthesis of the cyanoacrylate is carried out in
such a way that a C.sub.2H.sub.5 group of the cyanoacrylate based molecule
is replaced by the same group but that includes radioactive .sup.14C.
 When using .sup.14C as radio labeling isotope, the film-like material
is preferably a photographic film. The choice of film sensitivity, exposure
time and distance at which the photographic film is positioned with regard
to the fingerprints on the substrate depend on the desired resolution in
terms of reproduction of the fingerprints. If necessary, the photographic
film may even be brought into close or intimate contact with the substrate.
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