Chapter 847: Initiating the Screening
It’s not a simple matter to conduct DNA testing on all individuals involved in a case.
The Criminal Investigation Team in Binzhou City has many preparations to make.
Sorting out all personnel from three banks is one aspect.
Also, organizing the transient population from self-built housing areas is another important aspect.
Since the aim is comprehensive DNA testing, determining the scope requires thorough research.
Additionally, the materials for DNA sample testing need to be prepared overnight.
The Criminal Investigation Team in the High-tech Zone is facing another sleepless night.
On the morning of the third day after the incident, some DNA test reagents were ready.
"Captain Lu, I’ll first pull out a hundred people to collect DNA information from the employees of the three banks."
"The related reagents should arrive at about ten thousand sets in the afternoon. By then, we’ll add more personnel to collect DNA information from all the relevant people in the self-built housing area."
Lu Chuan is very satisfied with the efficiency of the High-tech Zone’s Criminal Investigation Team.
Moreover, although he suggested conducting DNA information testing yesterday, he did not provide a scope recommendation, which is not for him to decide.
Li Donglin, together with the director of the Binzhou City Public Security Bureau, communicated and finalized the plan before reporting to the city and starting today’s collection work.
"We’ll rely on you at the site, we’ll handle the information comparison at the rear."
There’s no need for Lu Chuan to go to the site; his main task is to organize the technical personnel at the rear to identify the collected samples.
The sample collection will be swift, but the key is ensuring thorough organization without missing anyone.
The greatest workload actually falls on the technical personnel in the rear.
Collecting a DNA sample may only take three to five minutes, but the analysis could take hours to yield any results.
Normally, the average time for a DNA test is seven to eight hours.
This mainly depends on the type of DNA sample, which determines the duration of the test.
The quickest samples are blood or saliva, with the shortest analysis time, typically yielding results in three to four hours.
If the blood or saliva sample is insufficient or involves hair or muscle, the DNA test time is longer, usually requiring 10 hours or more.
If the sample is bone or teeth, DNA identification requires even more time, typically at least three days, or possibly half a month.
For this DNA testing, Lu Chuan and his team will definitely adopt the simplest method, collecting saliva or blood samples.
This can significantly reduce the identification time.
Soon, the first batch of samples was taken, and Lu Chuan and the others began their busy work.
The DNA laboratory for the Criminal Investigation Team in Binzhou City is located on the top floor of the main building.
This DNA laboratory is much more humble compared to the one at the Criminal Investigation Team in Haizhou City.
The equipment inside is quite old, but it is well-maintained.
Actually, the most important aspect of a DNA laboratory is maintenance.
All DNA laboratories have extremely high cleanliness requirements due to contamination, generally equipped with special clean air conditioning that operates non-stop 24 hours a day.
All staff entering the quiet laboratory must undergo strict disinfection.
This time, Lu Chuan led five people to work inside.
The DNA information identification process differs greatly from what most people understand, as it’s not simply about putting the sample into an instrument, spinning it, and waiting for a beep to get results.
Processing a DNA sample requires multiple steps such as purification, decomposition, extraction, etc., to complete.
Moreover, after handling each DNA sample, the related instruments need to be cleaned, which is quite time-consuming.
Previously, when Lu Chuan worked on DNA identification analysis at the Haizhou City Criminal Investigation Team, he sometimes avoided drinking water to save time by reducing restroom breaks.
This is because each restroom visit necessitates repeated disinfection, which consumes time.
As Lu Chuan began his battle in the DNA laboratory, colleagues on other fronts continued their advancement.
Wang Song’s investigation into bomb-proof clothing is ongoing.
There are few offline stores selling bomb-proof clothes in Binzhou City, Wang Song has only found three so far.
These offline stores all sell military supplies.
They are shops run by military enthusiasts.
"This bomb-proof clothing is a knock-off brand with not much protective capability; it only looks nice and interesting, but actually, we don’t sell it."
Visiting one store, the proprietor immediately identified what kind of bomb-proof clothing the robber wore.
"Generally, offline stores don’t sell such things; most of our military supply stores are run by enthusiasts."
"Such items might be sold more frequently online; our enthusiasts in several nearby cities have a WhatsApp group. I’ll send the photo to the group later to see if anyone has seen this item."
Military enthusiasm is a small circle.
Few people know about it, but the circle has a high loyalty rate.
There is a group of people who love buying these items.
Because the circle is small and has few people, the market in Binzhou City is limited to only these three stores dealing with military enthusiasm.
Their owners are quite familiar with neighboring Tianzhou City and Haizhou City.
The boss posted the photo Wang Song provided in the group, and shortly after, someone replied.
"Old Hu, you’ve regressed, dealing with such knock-offs."
"This stuff is flashy, but useless; what’s up, you want to get a few sets?"
"It’s better to search online. Our circle definitely doesn’t have such goods."
"I have some friends asking; I’ll inquire."
Old Hu typed a line, then looked at Wang Song: "I’ll ask around first, if there are any clues, I’ll call you."
"Okay, you must call me."
"Don’t worry."
Wang Song left Old Hu’s shop and went to the other two shops.
He had similar results.
While Wang Cong investigated boutiques, Song Mingguang was working on related tasks, but progress was not very smooth.
"I just called my wife to tell her to make fried eggs tonight; we hung up, and that was it."
"I called my nephew to invite him over for a drink..."
"I called my dad and told him I wouldn’t be home for dinner, just ten seconds or so..."
Song Mingguang focused on investigating people with shorter call durations shortly before the incident.
However, from the current perspective, each person’s reason seems reasonable and unrelated to the robbery.
Although Song Mingguang can determine the duration of everyone’s calls, he can’t access the content of those calls.
So how exactly should he judge whether they are telling the truth or lying?