Profiler 4: Criminal Investigation Team

Jiao Yang said: "I once saw a case in an international paper. In a QJ murder case, no traces belonging to the murderer were found at the scene. However, the experienced investigators felt that it was on the nightgown worn by the victim. , There are some changes in the color of some places, which is speculated to be traces of hand sweat left by the murderer when he tore the victim's clothes.

However, due to the characteristics of the fabric, no complete and valid fingerprints can be collected.The unreconciled investigators used a new technology. On this nightdress, they managed to extract the sweat of the suspect's hands. Through the epithelial cells attached to it, they separated the DNA material and successfully found the suspect's body. identity. "

Hou Xiyong's eyes widened immediately, "I'll go, DNA can be extracted with just a few fingerprints, isn't that amazing?!"

"Is it possible? It won't be capitalism fooling us again, right? It's like the neutron weapons and anti-control radars of the M country. We have been chasing them barefoot for decades, and finally got them out. In the end, they didn't There is no real thing, it only exists on the PPT! Don’t toss around for a long time this time, it’s them bragging again!”

"Comrades, don't belittle yourself!"

Jiao Du came in and said: "There are several methods for extracting DNA in the world. It is nothing more than benzene/phenol/chloroform extraction method, centrifugal force method and magnetic bead method, each has its advantages and disadvantages. The first method is highly toxic and harmful to detection. The material loss is large, but the experimental materials are easy to obtain and the cost is low. The second method has high purity and is basically non-toxic. However, it requires a large number of instruments and equipment, high operating technology, and low flow rate. The third method is the perfect combination of nanotechnology and biotechnology , the use of consumables is low, the degree of precision is high, and it is particularly sensitive, which is very suitable for the field of forensic identification. Our country has long been at the forefront of the world with the magnetic bead method. If there is a shortcoming, it is that there is nothing wrong with it except for one expensive word!"

Jiao Yang said: "I'll figure out whether it can be extracted or not. But it's up to everyone to find someone who can be compared with DNA! The deceased was a 14-year-old minor at the time. According to his parents and grandparents, Because the management of the deceased was relatively strict, there was no mobile phone at that time.

So I speculate that if there is a suspect or murderer, there is a high probability that an acquaintance committed the crime, among relatives, friends, classmates, and neighbors in the same village.However, there were quite a few people in that town, and just collecting the DNA of the deceased's classmates and alumni was a big project.Let's work harder and strive to solve the case as soon as possible! "

When Hou Xiyong heard it, good guy, they are going to adopt crowd tactics and increase technology, using the most stupid, old-fashioned and most advanced methods together!

After the meeting was over, Jiao Yang stopped Jiao Du and said, "Do you think we can extract it from the Technical Detective?"

"That probably could be...not possible."

Jiao Du smiled and said: "Using what your colleagues said just now, if it is possible, can they close the case by accident three years ago? The nucleic acid extraction device is made by Tamei, Tade, Zhijiang and the Shenzhen gang. It’s the best. But if it’s available in the world, it doesn’t mean we have to have it in our bureau. You can make anything worth ten to twenty thousand or tens of thousands of dollars, so why match it with something so expensive?!”

Jiao Yang frowned and said, "Then you're just lying for a long time without doing this for nothing? I asked my comrades to send out a net to catch this person. What if I really caught him and couldn't extract the DNA? This is not Qing et al. How embarrassing? Where do you think there is such a high-tech equipment, let's borrow one right now!"

"I said boss, why do you want to look far away?

Jiao Du smiled and said: "Autogen recently launched the world's only fully automatic system extractor that uses precipitation chemistry to separate DNA genomes without RNA contamination. Our Yufeng Trading in Shanghai is their national general agent. Listen to this Name, do you know whose family it belongs to?"

"Cough cough..."

Jiao Yang said helplessly: "I've been talking with you for a long time, just to run on my sentence?!"

Jiaodu smiled and said: "What is a run, I am Hongguoguo's jealousy, can't you see it? Boss, I will point you to a golden Buddha and tell you to get the scriptures. You are not happy, even if others envy you." Come on?!"

Hi, it's all about solving crimes!Even if he was asked to sacrifice a little bit, to sell something, it would still be generous...

After Jiao Du left, Jiao Yang called Lu Yuanli.

Unexpectedly, he was still nervous when things came to an end.When Jiao Yang thought about doing this kind of thing for the first time, his face still felt warm, and it took Lu Yuanli a while to understand what he said on the phone.

"Oh,"

Lu Yuanli said lazily: "You mean the nucleic acid extractor of Autogen's new system? How can I remember that this kind of instrument has not been put on the market yet, and it should not be available in China."

As soon as Jiao Yang heard it, the sweat on his forehead came down, "It's all for work, little ancestor, do you want me to kneel down and beg you?!"

Lu Yuanli said, "So you're in such an urgent mood this time? Is there any quid pro quo?"

Jiao Yang said: "Is there any hidden/rules/rules?"

Lu Yuanli said speechlessly, "It's as if someone cares about you!"

Jiao Yang looked at the sky and said, "Just...Professor Lu, I suggest you accept it, otherwise, wouldn't it be like I'm prostitution/whoring you?"

"Neuropathy."

Lu Yuanli smiled and said, "An Ran, come here for a while."

Jiao Yang was on the other side of the phone, only heard the sound of the mouse beeping non-stop, and felt that everything hit his heart.

An Ran flipped through the product catalog for a while, before saying, "Mr. Lu, we only need one of this machine, and now it is for display in the exhibition hall!"

Lu Yuanli nodded, picked up his phone and said, "Did you hear that? It's in my company's showroom. You can send someone over to check it out."

"It's a good feeling!"

Hearing this, Jiao Yang hit the snake with the stick, and said shyly, "Mr. Lu, can we have a discussion about this matter? He can also pay a monthly subscription. Otherwise, I will do it for you." A card, you donate this instrument to the bureau..."

Lu Yuanli chuckled lightly and said, "The purchase price of this machine says 5000, US dollars. I want to charge you [-] for wear and tear even if I borrow it once. Team Jiao, you seem to be overthinking it, don't you?"

Jiao Yang coughed and said, "Mr. Lu, you are not being objective when you say that. After all these years, I have not charged your wear and tear fee!"

"You are a double bar and a star, what about your face?"

When Lu Yuanli heard that, he almost sputtered, "Okay, stop talking nonsense, you can pull it away quickly, or I'll change my mind!"

Hou Xiyong went over and not only brought the machine, but also borrowed a technician from someone else.

In addition to the gold powder scattered on the ground, the staff of the technical investigation also extracted some gold powder along the damage marks on the skirt worn by the deceased, and left half of each.In this way, the inspection materials will be more abundant. Once the extraction is unsuccessful, the original materials can be left for the next time when the technology and equipment make great progress.

However, there is a reason why you are expensive. After debugging this machine, the results came out in about half an hour.

Not only was human DNA isolated from the sample, but it was from two individuals, one of which belonged to the deceased.

This made the members of the task force who had been guarding outside the laboratory all rejoice.

Hou Xiyong couldn't help giving a thumbs up and said: "It's only been less than half an hour, this is too awesome!"

In order to ensure the legitimacy and purity of the experimental samples, the comrades of the Technical Investigation Detachment must separate and extract the DNA.

When the technicians of Lu Yuanli's company heard Hou Xiyong's words, they smiled proudly: "What's the matter? In the past two years, the epidemic's requirements for nucleic acid extraction instruments have increased by leaps and bounds, giving related technology companies a chance to take off. Our machine, said It is no exaggeration to say that it is the top in the world, it can process 20 samples at the same time within 48 minutes, and easily process [-] to [-] samples a day!"

While lamenting the rapid advancement of technology, Jiao Yang is naturally more interested in another DNA.

Xu Mengzhen has been paying attention to the progress of the case.As soon as he heard that Jiao Yang had found the DNA of the second person on the scene, he immediately rushed to the special service detachment.

Seeing Jiao Yang, Xu Mengzhen stepped forward solemnly and said, "Captain Jiao, have you found the suspect?"

"You can't say that just yet."

Jiao Yang explained to Xu Mengzhen his deduction of the case.

When Xu Mengzhen heard this, he felt mixed feelings and was speechless for a while.

The situation he is now facing is actually very embarrassing.Perhaps the nature of this case is indeed an accident.But at that time, he failed to find the second person on the scene, which can be said to be dereliction of duty, or it can be understood that the handling is not perfect, and the chain of evidence is not particularly strong and sufficient.

But no matter which one, if others can do it, you can't, it means that you are not capable enough.

What's more, you have no way of judging, let alone controlling, what the leaders above think, or what the big leaders above think.

Xu Mengzhen couldn't help but smiled wryly and said, "I didn't expect that the key to solving the case was actually that bit of gold dust on the ground! Maybe it was influenced by public opinion, and I always thought that the murderer was practicing feudal superstition. Hey, what a misconception!"

Seeing him like this, Jiao Yang inevitably felt that something hurt him.

Jiao Yang considered his words for a while and said, "Captain Xu, I personally think that there is nothing wrong with you closing the case as an accident back then..."

"Brother, we are all in this business, so don't comfort me!"

Xu Mengzhen sighed and said, "If I didn't find this person, I'd be dereliction of duty. Well, there's nothing to say. Now that the result has finally come out, the boots hanging on my head have finally fallen off. I'll wait for my superiors to deal with it!" "

Jiao Yang looked at the back of Xu Mengzhen striding away, and couldn't help admiring him.As the leader of the task force, he knew very well that during the entire process of solving the case, Xu Mengzhen or the rest of the Xu family did not use their influence to impose any obstacles on him.When the truth is about to come out, he can admit his mistakes calmly, which is really like a general.It can be said that it is a blessing that the most ace power in the system is in the hands of such a person.

At this time, the members of the other task force were divided into two groups.Some people set up a site in the alma mater of the deceased, and gathered all the classmates and alumni of the deceased who could be found to collect DNA on the spot.

Another group of people set up a station near the deceased's home to collect the DNA of male neighbors in the deceased's town.

When Jiao Yang got out of the car, he saw a familiar figure poking his head in the distance.that man is...