Detecting excrement is a technical job, which is equivalent to going to the hospital for a physical examination. The doctor will ask for a excrement test.
Gu Chen was not afraid of Officer Wang's jokes. Anyway, at present, the important clues had not yet been found. Taking bird droppings and bread crumbs to the technical department by himself was a kind of leisure in the busy schedule.
By the way, it's time to return the manuscript to the forensic assistant.
It is a bit unreasonable to say that although the observation ability that has just been upgraded to the professional level is very strong, he has achieved nothing in Aguda Takasugi's residence.
Of course, after rigorous investigation, the information captured by professional-level observation is also complete.
After investigating the entire room, no suspicious points were found, but Gu Chen was the only one who had a special liking for the dead canary, as well as the bird droppings and bread crumbs left on the ground.
I always feel that there is a flaw in my observation skills?
Or during the improvement process, there is a deviation in the observation of details, and over-interpretation of originally insignificant places.
But the problem is that after investigating a series of cases, I have verified the excellence of each of my skills one by one. It seems that there is no so-called deviation, and it is even more accurate than the observations of ordinary old comrades.
However, Gu Chen did not expect that he would be overly confident in future cases based on his previous experience.
The vast majority of unjust, false and wrongful cases often result from the police over-confidence in past so-called experience in handling cases.
In some unconventional cases, it is often necessary to break the rules and investigate from another perspective, and perhaps unexpected clues can be found.
Gu Chen was not fighting against the bird droppings now. If it hadn't been inconvenient at the time, he would have taken the canary's body away with him.
Although this sounds ridiculous...
Officer Wang drove the car to the Municipal Bureau compound and under the building where the technical department is located.
"Gu Chen, I convinced myself to bring you here because of my absolute trust in you." Officer Wang spoke strangely.
"So?" Gu Chen asked.
"You can go up by yourself later, don't tell me I brought you here, okay?" Officer Wang looked at Gu Chen with a bitter look.
Gu Chen nodded: "I know, then I'll go there first."
Opening the car door, Gu Chen was about to go alone, when Lu Weiwei stopped him: "Junior Brother Gu, I'll go with you."
"OK."
The two left side by side, leaving only Officer Wang in the car with a confused look on his face.
"It's okay if you go alone and lose face, but what if you go two people? Aren't you afraid of being laughed at by your comrades in the city bureau?"
Since he was about to be on the honor roll, Officer Wang suddenly felt that he was also a man of honor.
It's okay if the case is blocked. I followed two subordinates here to cause trouble for others. Such a thing... I don't want to happen a second time.
Gu Chen and Lu Weiwei took the elevator and went directly to the fifth floor of the building.
This is where the technical department is located. Although there are not many personnel, there are quite a few laboratories and various testing instruments are quite complete.
As soon as he entered the door, Gu Chen saw the forensic assistant who had lent him the manuscript earlier. He immediately called him Senior Brother Wu.
The forensic assistant narrowed his eyes, turned around and said in surprise: "Aren't you that Gu Chen?"
"Yes, Senior Brother Wu."
"What are you doing here?"
"Return your manuscript." Gu Chen handed the manuscript in his hand to him.
The forensic assistant was stunned and looked at him in disbelief: "Gu Chen, you just finished reading it all? Not so fast, right?"
In the impression of forensic assistants, it is unrealistic to master the essence in just a few months.
Moreover, Gu Chen usually has to go to work. Thinking about it, he should take photos first and then organize and study them when he has free time. It should be like this.
"I have indeed finished reading it." Gu Chen also said modestly: "Senior Brother Wu recorded it in great detail, which has benefited me a lot."
The forensic assistant took the manuscript, checked it carefully, and said casually: "Okay, I have nothing to do, so I won't send it to you."
"No." Lu Weiwei suddenly stopped him: "We are looking for Dr. Liu, is he here?"
"Here, it's in the No. 2 testing room. You can go there by yourself." The forensic assistant looked very busy. After a few brief explanations, he left first.
Gu Chen and Lu Weiwei found the No. 2 testing room by themselves...
At this moment, Forensic Doctor Liu was writing a report on his desk, and it seemed that he had just completed a test.
Gu Chen knocked on the door and walked in: "Forensic Doctor Liu, I'm here to trouble you again."
Forensic Doctor Liu raised his head and pushed up his glasses: "Hey! It's Gu Chen and Wei Wei, why are you here?"
"There are a few things I would like you to help test." Gu Chen took out the document bag.
"Are you in a hurry?" Forensic Doctor Liu asked with eyes wide open.
"Yes, it's very urgent. It's best to take it away after the test." Gu Chen was also impatient. Since he sent it to the technical department in person, he didn't want to make another trip.
"But I still have a report in hand."
"Forensic Doctor Liu, please help me and join the queue." Lu Weiwei said with a pretentious look.
As we all know, forensic identification takes time.
It's okay if it's not busy. If it is busy, many testing items need to be queued up for testing. After all, everyone hopes to get results as quickly as possible in the shortest time.
Forensic Doctor Liu nodded and said with a smile: "Well, for the sake of you two sending it here in person, let's bring it. It just so happens that I am not in a hurry with this report."
"That's great." Gu Chen quickly opened the document bag and handed several packages of bird droppings and bread crumbs to Forensic Doctor Liu.
"Do you want to test feces?" Forensic Doctor Liu asked.
"This is the feces of a canary. I suspect that this canary may have eaten poisonous substances, so..."
Gu Chen also expressed his guess.
Forensic Liu had worked with Gu Chen many times and quickly understood what he meant.
Although I don't know if there is any necessary connection between this and the case, it will definitely be helpful to Gu Chen in handling the case.
"Wait a moment." Forensic Doctor Liu took the sample and went to the instrument without saying a word.
Nowadays, forensic testing of excreta is no longer as cumbersome as before, but most of the excreta extracted are from humans.
However, it is still difficult to extract a person's DNA, but it may be possible to identify the person's DNA.
The reason why it is difficult to extract is that feces contains undigested DNA fragments from food.
The DNA of intestinal microorganisms and the DNA in the shed cells of the host's digestive tract are essentially the same, and it is impossible to separate this person's DNA from other DNA.
But for most cases that need to be identified, it is feasible to identify the owner from fecal DNA. DNA identification is feasible.
Some parts of human DNA are highly variable regions that are different for everyone and only require the use of a specific gene amplification method.
This is the so-called pcr, polymerase chain reaction.
By amplifying this highly variable region, identifying the sequence, and comparing it with a database or a person's DNA, you can know the correspondence between the feces and the owner.
In other words, you don't need to extract all the DNA, you just need to identify the DNA.
In fact, forensic identification is all carried out through this method.
The results Gu Chen needed were actually much simpler than identifying DNA. They just needed to find relevant points from animal feces.
Forensic doctor Liu's detection speed was a bit fast. After comparing the data values, he told Gu Chen: "I can tell you now that these bread crumbs do contain highly toxic substances, and they are also found in the feces."
Gu Chen's eyes lit up. This was the result he wanted. It seemed that the previously interrupted clues were suddenly connected again.
"In other words, this canary died after eating this poisonous bread for a long time?"
Forensic Doctor Liu nodded: "Yes, it is indeed caused by long-term consumption. I have a test result here. You can take it first."
Gu Chen took the report, stood up and bowed: "Thank you, Forensic Doctor Liu, for your help this time."
"Nothing." Forensic Doctor Liu chuckled.
However, Lu Weiwei on the side looked confused. She quickly asked: "Junior Brother Gu, have you discovered anything new?"
Gu Chen said mysteriously: "Let's talk in detail when we get in the car. Didn't Senior Brother Wang want me to find clues and report them? It just so happens that I have the basis now."
