New Gods of North America
fingerprint
After much wandering, Wayne finally chose to run another trip with Conner and the others.
After all, although there had been relevant courses in the detective agency before, it was the first time to use the "fingerprint verification" plan in practice.
In order to achieve a better "sampling" effect, Wayne felt that he should guide and supervise on-site,
Although he couldn't be considered "experienced", he had at least seen similar content in various detective novels and detective dramas, barely counting as "having seen a pig run".
Inisa and Lina, as well as other agents, were also quite curious, so the temporary base camp almost "mobilized all their forces".
The group first went to the cathedral and the police station to ask for the address, and found the two "Williams" to be witnesses, taking them to work overtime.
The William police chief originally felt that the "fingerprint" thing sounded unreliable, with a bit of vigilance in his expression, "Are everyone's fingerprints different? Can it be used to find the murderer?"
It was too troublesome to explain the technical aspects in detail, so Wayne chose to prevaricate:
"I used to be a sheriff 'family' in a western town, and I have many years of sheriff experience starting from my uncle. I am also a student in the academy, and I have been praised by professors, and some academic achievements have been applying for honors (although in mathematics), you can trust me in this regard, just help witness it."
Tom Hagen's William assistant was more cooperative in comparison, and generally trusted the detective agency's behavior, but he also became curious about Wayne's experience, and also asked about some situations of Uncle Benjamin.
Limited by this era, the actual methods that the detective agency can use to extract fingerprints on-site are actually only "powder method" and "iodine fuming method".
The former is temporarily using repeatedly ground graphite powder plus a soft brush, which can only be used to collect fingerprints on relatively smooth surfaces such as glass, ceramics, and polished metal.
The latter is to cover iodine monomer, and after roasting sublimation, the fingerprints are revealed by relying on the reaction between iodine and grease.
Fortunately, iodine tincture has been included in the official pharmacopoeia of the American Medical Association more than ten years ago, and silver plate cameras also use elemental iodine when imaging, so this thing now has a 'market', otherwise the detective agency would have to obtain it themselves,
Even if the purity of this thing is still a bit lacking, the effect is enough for fuming.
In front of the detective agency and the two Williams, Wayne pressed his fingerprints on a piece of white paper, and then demonstrated the on-site operation again with a beaker and candles, and a not very clear fingerprint quickly emerged:
"You see, the facts prove that this method is feasible. Theoretically, after the crime, only the police have searched here. The detective agency's agents are wearing gloves at the scene, so if the fingerprints of the investigators are excluded, then the remaining fingerprints can be temporarily included in the suspicion."
Similar experiments have actually been demonstrated in the detective agency's internal courses, and some agents have also operated it themselves.
This time, it is rare to have the opportunity to play like this, or to "fight in real battles" in actual investigations, so the agents are more interested, and even Inisa and Lina each brought a set of tools to play on the spot.
Compared to the daytime, there is actually another advantage at night. Some fingerprint marks are not obvious during the day, but at night they are faintly marks under the candlelight, and are easier to be noticed.
The mailbox outside the murderer's house was quickly wholly fuming by the agents like cupping, and a blank envelope near the ashtray in the living room quickly became the "focus target" in the eyes of everyone.
Compared to "making fingerprints appear", what is more troublesome this year is "collecting fingerprints".
Ryan's photography ability can only be used for the detective agency to look at it internally, but if it is to be taken out as a clue and evidence, people have to trace the fingerprints according to the appearance, and some things have to be taken away directly.
That night, more than a dozen things that might be "problematic" were collected overnight. The next morning, Wayne and the others went to the police station again to collect the fingerprints of the police officers who had searched the scene and the murderer's fingerprints to "eliminate interference".
Collecting fingerprints of living people is relatively simple. Let people leave fingerprints on paper with fresh garlic juice, and it can be revealed after fire roasting, and can also be preserved for a period of time.
Facts have proved that in this era when "solving cases with fingerprints" has not deeply rooted in people's hearts, the probability of successfully finding a bargain is still very high. A strange fingerprint was indeed found on that seemingly blank envelope.
Some police officers originally had doubts about the fact that "fingerprints are almost impossible to be exactly the same". Wayne directly threw the "fingerprint collection cards" of the police officers and the murderer over, let them find out if there are any completely identical ones, and give 100 US dollars for finding a pair.
Then the police officers repeatedly checked and passed around until Wayne and the others left, and they failed to earn the bonus successfully. They found that some fingerprints may look similar, but the shape, size and lines are difficult to be completely consistent, and the suspicion in this regard was quickly reduced.
I just feel that the "talented student of the academy" and the "special investigator" found by the City Police Committee are really a bit of something.
After dispelling the concerns of the police station, Wayne and the others took the envelope that could no longer be considered "blank" before leaving, and went to the murderer for questioning.
Although the murderer seemed to have faintly guessed when he was asked to collect fingerprints before, he was obviously shocked when Wayne put the discovery of strange fingerprints at the scene in front of him. I didn't expect the investigation technology of this era to have become so terrible.
"Next, we will also collect the fingerprints of your neighbors to eliminate more interference. But that may not be important, this envelope has no postmark and address, obviously not sent to your home through normal mail. The letter seems to have been burned before you went out to commit the crime, indicating that the information inside is not ordinary, if you confess your accomplices yourself, there may be room for redeem this matter."
To be honest, in the face of a "scapegoat" willing to bear the death penalty, more evidence is sometimes useless. Wayne is just " taking a shot at it" whether there are dates or not.
The detective agency's fingerprint collection is more meaningful to show to the cathedral and the police, proving that there is indeed a hidden "third party" or "third party" in this case.
The murderer also knows this well. In addition to the shock, he still chose to continue to forge ahead with a heavy load alone:
"This matter is my own idea from beginning to end, and has nothing to do with other people. The clues you found look very interesting, but unfortunately it has nothing to do with this case."
How much hatred do you and Tom Hagen have, is it worth you to die like this?
The detective agency has tentatively officially proved that there is a larger "iceberg" behind this case that has not been excavated.
Therefore, the intensity of the investigation has been strengthened again. Inisa and Lina took people separately to trace the murderer's past experience, such as going to the places where he had worked, and checking the situations of some things mentioned in his experience.
And Wayne temporarily set out half a day to report to Mr. Russell, the financial backer of the First Office,
Investigating the case is investigating the case, business is business.
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