There is no distinction between the four on-site survey photography methods. Each method has its own applicable scenarios and its own advantages.
For example, the central photography method used by Lu Chuan this time is to record the characteristics of the central object at the scene, as well as the relationship with adjacent objects and traces.
Its characteristic is the magnification ratio and sensitivity of the evidence, which can completely restore the situation at the scene.
When comparing tire marks, the size of the mark and the color of the mark are all important factors for comparison, so the center photography method is most appropriate.
As for detailed photography, what stands out is the details.
Among the on-site survey photography procedures, only detailed photography can take photos of individual traces and objects without being separated from the surrounding environment, reflecting the shape, size and detailed characteristics of on-site traces and objects.
The requirements for detailed photography are relatively precise. It is necessary to ensure that the traces and evidence being photographed are kept parallel to the lens and photosensitive film, and that the objects and traces being photographed are not deformed.
At the same time, when using detailed photography, you must also follow the principle of proportional photography to accurately reflect the size, thickness and length of the traces and evidence being photographed.
For example, the degree of wear of tire treads and the details of specific damage. These tiny marks are easier to compare and analyze using detailed photography.
Lu Chuan had basic on-site survey photography skills at hand, and these tasks were carried out smoothly. It was easy to complete an ordinary central photography and detailed photography.
The focus is on the subsequent modeling of the tire marks.
In tire mark analysis, comparison requires not only photos, but also a fixed model.
Of course, now that time is tight and tasks are heavy, it is too late and unnecessary to shape the model.
These tasks will only be used after the case is solved and tire marks are needed as evidence.
As for the production of models, there are related skills in the intermediate tire mark identification analysis.
This is a bit like a dentist's job because dental plaster is used.
Dental plaster is different from ordinary plaster. This plaster will harden faster after being filled with objects.
General dental plaster is made from beta model gypsum powder, while dental anhydrite is generally formulated with alpha gypsum powder.
There is also a kind of dental superhard gypsum, which uses special alpha gypsum produced by the liquid phase method as the raw material.
The three types of dental plasters are occasionally used by forensic medicine and trace examination. Different types of plasters are selected according to different usage scenarios.
Lu Chuan had no similar experience in surveying a car before.
Fortunately, Wang Hao and the others are also here. These people are all experienced spot surveyers, so doing this kind of spot survey is a piece of cake.
As for the DNA test materials extracted from the basement yesterday, the comparison has been completed.
The comparison results cannot be said to be gratifying, or rather not very gratifying.
A total of six people's DNA information was found, and only one person was matched, the missing Goldman Sachs.
Now, it is basically certain that Goldman Sachs has been murdered.
There were no blood stains in the BMW and the car was very clean.
However, some hair and dander were still found in the trunk.
The DNA detector is going to be busy again.
In one morning, the preliminary work of the current survey was basically completed, and the corresponding DNA testing materials were also being processed.
There should be results by this afternoon.
And good news finally came from the front line, where Li Donglin focused his main attention.
Wang Liang, the boss behind Twenty-nine Biological Co., Ltd., was finally found.
Not in BZ City, the people are hiding in the provincial capital, so we can do it directly there.
Of the three people Lu Chuan found through fingerprint identification analysis, two of them were also found.
These two people are both in BZ City First People's Hospital.
One of them was a patient who had just undergone a kidney transplant.
The other person was his primary care physician.
The patient is under control at the hospital and the doctor has been arrested.
In Li Donglin's words, if a doctor's fingerprints appear on the operating table in the basement of Chen Gang's villa, you should know what role he played.
This time, there is a breakthrough.
In the hospital, kidney transplant patients poured beans out of bamboo tubes and talked about everything.
"Five million, they said my matching model is not available now, and if I want surgery as soon as possible, I have to pay for it!"
"Where was the surgery performed?"
"I don't know. I was anesthetized at the time and didn't know anything."
In the interrogation room, the doctor who performed the operation was as pale as a sheet of paper: "I...I am only responsible for the surgery...others...I...I really didn't participate, really!"
The interrogation work is in full swing and the arrest work is non-stop.
This is a secretive criminal organization that currently involves a total of eight people.
Doctors from Binzhou First Hospital are responsible for connecting patients and then hand over matching requirements to Chen Gang.
Chen Gang directed Wang Manli to compare the blood information of all medical examiners at Qingsong Physical Examination Center.
After finding a receptor that meets the matching requirements, he deceives the other party through seduction and other methods, and Chen Gang is responsible for making the other party disappear.
Wang Liang was responsible for establishing a shell company to deceive the hospital's supervision and use donations and other methods to meet the needs of patients.
There are four others, all from Binzhou First People's Hospital.
Including a security guard, two nurses and an ambulance driver.
Four people working together can get a person out of the underground garage of the hospital without anyone noticing.
Early the next morning, all known suspects were arrested and brought to justice.
Lu Chuan had no matching fingerprints in the system, but the fingerprints collected from the nurse and the ambulance driver were successfully matched.
"Ding!"
"Advanced mission completed: The host successfully participated in the provincial task force, extracted fingerprint information on the operating table, and became a key clue to arrest the suspect. He completed the on-site investigation of the vehicle involved in the case, fixed the suspect's criminal evidence, and successfully provided technology for the investigation of the case. support."
"Task reward: one intermediate skill card. The host is asked to choose the type of reward."
Wow...
In his mind, the system reward interface opened again, and dense skill options appeared in Lu Chuan's consciousness.
"Intermediate spot survey skills!"
This time, Lu Chuan did not hesitate and directly chose an intermediate skill below criminal investigation technology.
Survey now!
As a detective on the scene, what Lu Chuan mastered most was the ability to detect traces.
Intermediate footprint identification analysis, advanced fingerprint identification analysis, intermediate skeletal analysis and intermediate tire mark analysis.
But in the field of field survey, Lu Chuan only had a junior field camera and an intermediate fingerprint collection skill.
This time, when doing the on-site survey of the basement of Chen Gang's villa and the BMW car, Lu Chuan clearly discovered his shortcomings.
When it comes to on-the-spot photography, there is no problem. Although the junior on-the-spot photography is not that outstanding, it is equivalent to the ability of the general criminal investigation detachment's on-the-spot detectives.
When it comes to fingerprint collection, Lu Chuan is not afraid.
Intermediate fingerprint collection skills made Lu Chuan much better than his colleagues in this area.
Wang Hao did not collect the fingerprints on the operating table.
But for other things, such as snapping things into the gaps between floor tiles, Lu Chuan Sheng was careful and not yet at the age where he could regard work as work.
But in terms of technique and professionalism, there is a gap between him and Wang Hao.
During the on-site survey in the BMW, except for the extraction of tire marks, Lu Chuan showed a very high level of professionalism. At other times, he was basically stealing from others.
Now that he had acquired the intermediate spot survey skills, Lu Chuan breathed a sigh of relief.
