"I can't even confirm what the evidence particles are."
Shen Ting was very surprised when he looked at the technician's appraisal report.
In his impression, the identification personnel of the Public Security Bureau are not omnipotent, but they can basically identify the physical evidence involved in the case very easily.
But the suspicious particles collected from the victims in this case, especially the wounds and cross-sections of the body parts, could not be confirmed to be what they were?
With the help of electron microprobes, infrared spectrometers and other equipment, those particles were basically identified into two categories:
One type of ingredients is very complex, including protein, oil, salt, etc.
And the quantity is very small!
Technicians dare not conduct consumable identification on them that affects their physical and chemical properties.
The other type is just the opposite and is the most common glass.
But precisely because it can be seen everywhere in life, it is even more difficult to determine its specific source.
Guan Hongfeng: "It depends on what the technical staff say. If there is still no progress in the follow-up investigation.
It seems they are planning to report this to the Dajing Public Security Bureau and ask them to send more professional technicians to help with the identification."
Tang Ren: "Damn, this technique is too bad, right?
You can't even identify a few particles?"
Forensic doctor Qin Ming: "You can't say that!
There is definitely a gap in the identification level of public security at all levels.
The instruments and equipment, the quality of the appraisers, etc. are all different.
It is normal to ask for help from higher-level people when encountering difficulties."
Tang Tan Qin Feng: "The key point is, I saw that the appraiser's analysis of the evidence particles was actually very specific.
We have basically done everything that can be done.
The problem is that those particles are either too complex or too common.
It is really difficult to determine the exact source!
The next step is to seek help from experts in related fields, which is a normal operation."
Kiko: "What should we do now?
Waiting for news from the investigation team to see if they can find any new clues at the crime scene?
Or wait for the appraiser and find a more capable technician?
Or, should we continue to check the information?
( ??? ? ??? )”
Shen Ting frowned slightly.
He didn't want to sit and wait for death, nor did he want to boredly check the information.
"Perhaps, I can try to identify those particles myself?"
It is called identification, but it is actually discrimination!
Because it requires the use of the physical and chemical properties of instruments and equipment, as well as a lot of data, the appraiser has actually completed it.
What we need to do now is to give the exact source of the particles based on this data.
Shen Ting looked at the skill column in the private window, scanning each skill.
It ultimately landed on a technique called "forensic geology."
Forensic geology studies various minerals.
The identification personnel's preliminary conclusion on the two particles was that they were both some kind of mineral.
"Do you want to exchange it?"
Shen Ting hesitated for only a few seconds, "Change!"
Aren’t the ten initial skill points given by the system meant to be used at this time?
"Exchange for Court Geology!"
[Consume ten skill points, skill exchange successful! ]
Forensic Geology, Introduction:
Soil is composed of different rocks, minerals, mud and sand.
Man-made particles such as plastic, concrete, metal particles, bricks, as well as materials such as fibers and pigments, can also be mixed into the soil.
These substances increase the specificity of the soil.
Just as there are no two fingerprints that are exactly the same, there are no two soil samples that are 100% identical.
Even trying to make them the same artificially is impossible.
Forensic geology is based on this specificity and uses the Local Exchange Principle as its theoretical foundation to study the movements of individuals involved in a case, the location of the initial crime scene, the location of the body dumping site, and so on.
With the successful exchange of skills, Shen Ting quickly mastered forensic geology.
How to use polarizing microscopes, X-ray diffractometers, scanning electron microscopes and other instruments to identify geological materials.
How to separate individual particles from a sample and identify their characteristics.
How to quickly find rare and representative minerals, etc.
All are involved!
"The identification techniques of Chaoyang's technicians are indeed crude!"
As he digested the relevant knowledge, Shen Ting saw that the technicians' identification operations were full of loopholes.
He looked at the identification results of the two types of evidence particles again.
The infrared spectrum and electron microscope energy spectrum, the originally tortuous lines like the heavenly book, suddenly became clear and understandable.
“The first type, which has a larger number of particles, is indeed very common glass.
However, judging from the identification picture, it is not ordinary glass.
It's glass particles from the copper smelter!"
In the smelting of crude copper, glass needs to be added as an oxidizing agent.
Helps oxidize the iron and sulfur in copper ore, making them easier to remove.
The resulting glass particles would be sprayed into the air from the copper smelter's chimneys.
It then falls into the soil and becomes a specific component in the soil.
These glass particles look similar to ordinary glass.
However, their composition and characteristic points are determined by the smelting method, as well as the composition and properties of the copper ore itself.
In terms of details, it actually has its own characteristics!
"interesting!
Our Chaoyang copper smelter has been closed for more than ten years.
I didn’t expect it to be involved in this case.”
The Chaoyang Copper Smelting Plant was originally concentrated in the south, and Shenjia Village where Shen Ting was located was located in it.
Since there were a lot of glass particles on the murderer's axe, he probably lived in the South!
However, the southern part of Chaoyang is also quite large, and has a large population...
Shen Ting frowned slightly and looked at the identification data of the second particle:
"These particles appear to be composed of substances such as protein, grease, and mud.
But they are actually more like stains on the outside of the particles.
If we remove the influence of these substances on the spectrum, the true composition of the particles should be -
Solid brine granules?! "
Shen Ting was stunned for a moment.
Brine is the liquid remaining after salt production from seawater or salt lake water, which is the crystal obtained after evaporation and cooling.
Chaoyang does not produce!
The key is!
This brine is most commonly used to make tofu.
Brine tofu is made by dissolving solid brine in water and then adding soy milk!
Shen Ting is too familiar with this process!
Because his family makes tofu!
He often watched Lao Shen smash a large piece of solid brine into small pieces, put it into a large vat, and pour water to dissolve it.
When ordering soy milk, stir the soy milk while holding a red ladle and pouring the brine into the soy milk little by little!
and!
When making tofu, protein and soybean oil are indeed produced. Doesn’t this explain the amino acids and oil stains on the surface of the brine particles?!
Recalling this process and the fact that Shenjia Village was just south of Chaoyang, Shen Ting's scalp suddenly tingled:
"Um?
The murderer, the murderer couldn't be Old Shen, could it? "
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