Compared with the entire inspection process, the time it takes to extract the inspection material from the lightning tube is not long.

It took only ten minutes before and after, and immediately went to DNA laboratory for experiments after extraction. The first time it was not detected, it was returned to the temporary laboratory where the lightning tube was placed and then extracted. This was repeated until after 11 o'clock in the evening.

It is easy to do things with money. Starting from 6:30 pm, micro-inspection equipment purchased urgently will be delivered one after another.

Director Cui did not wait. He worked with the Director of Police Security, Political Commissar Xin of the Detachment, and Wei Shaowen, instructor of the Technical Brigade, and others to direct the technical police to pack up two offices and place instruments and equipment worth more than 4 million yuan, and ask after-sales service staff to debug on the spot.

It is said that it is debugging, but it is actually a demonstration. People who can operate it are extracting the DNA on the lightning tube. If you buy such expensive equipment, it is not a decoration. It must play a role as soon as possible. It is best to find out before dawn whether there are any explosive residues such as chlorine-acid-potassium, nitro-ammonia, t-n-t, etc. in the sample collected from Xinyuan Community.

People who sell these instruments and equipment, especially after-sales services, are all "experts". They go to major research institutions across the country almost every day. Doing such tests is actually a pediatric department for them. Han Bo is doing the fifth experiment in the DNA laboratory, and their test results are first released.

"Yungong, are you sure that the dozens of samples of the sampled materials have no explosives in them?"

I used to only want to go to the Central Academy of Sciences and major colleges and universities with great wealth, but never thought to go to the Public Security Bureau. As a result, the Nangang Municipal Public Security Bureau came to me and bought a set at once.

Doing such a big business, staying up late is nothing.

Yun Zhixin was tired and happy, holding his glasses: "Director Cui, there is a residual explosive, otherwise how could an explosion occur? However, only trace residues of air-conditioning refrigerant were detected, and no other residues such as chlorine-acid-potassium were detected."

Not only did he have a master's degree like "Korean Strike", he also taught at a famous university in China.

Not only did he sell these imported instruments and equipment, he also helped train technical police officers to inspect and analyze and maintain the instruments and equipment according to the terms of the contract.

He said that there would be basically no one without it.

The residuals of bombs that were not artificially manufactured indicate that the quality inspection department has no problem determining the cause of the explosion three years ago. Although the two explosions cannot be combined, at least it can be confirmed that there is only one bomb so far.

Director Cui breathed a little relieved and invited comrades from the Police Security Department to accompany the experts to have midnight snacks. After the midnight snacks, he sent them to a hotel to rest. The on-site inspection of the infrastructure construction site of the Ocean Engineering Group was completed. The technical police had no particularly important tasks in the future. While the experts were in Nangang, they were organized to receive training from tomorrow.

All arrangements are made and informed to the task force.

The phone number was just over and was about to report to Director Chen who was waiting for the news. The door of the DNA laboratory was opened.

"Xiao Han, how about it?"

"I finally found out that I have fulfilled my mission, but there is only one person, but no one else." Han Bo handed over a map and sat on the ground against the wall, feeling relieved.

"Okay, OK, great!"

Director Cui was so excited that he couldn't recover. He held the map tightly and laughed: "Lei-Guard is not RMB, it's too late to hide. Who would touch it with his hands without any trouble? It's definitely the suspect, it can only be the suspect. This is a breakthrough progress. Xiao Han, your danger is not in vain. You will be the first to solve the case!"

"It doesn't matter whether you make a contribution or not, the key is to solve the case."

Wearing a dozen kilograms of explosive clothes and working with him for more than ten hours, Han Bo was really tired. He took the water from Li Jiaqi and took a sip of it. He said weakly: "Dr. Cui, from now on, as long as there is a blood sample of the suspect, he will be tested and compared immediately."

"Yes, it's important to solve the case. Take the time to rest. There are many suspects, and you will be busy next."

"I insisted until dawn and asked Dr. Tian to come and help tomorrow morning. From tomorrow on, two shifts were served, and the equipment was stopped until the suspect was compared. By the way, Director Cui, we have no criminal record. The Donghai Municipal Public Security Bureau has it, and it is not far away. If the suspect has been to Donghai and has a criminal record in Donghai, then he can be compared as soon as possible."

"This is a good suggestion. I will immediately arrange someone to take the inspection report to Donghai. Please ask 703's colleagues to help compare."

We must inform the task force command, report to Bureau Chen, and ask Deputy Director Tan of the Provincial Department's Criminal Investigation Bureau to help coordinate. Director Cui was so busy that he answered the phone. After a few words, he stuffed his phone into Han Bo's hand, and went out to arrange for people to prepare a car to go to the East China Sea overnight.

"Xiao Han, doing a pretty job. Given the seriousness of the case, there is a problem that must be clarified. Lei Guan has a suspect on it. But Lei Guan has not exploded, but has experienced an explosion. I don't know how long the bomb has been made. This test result is now a clue to the case and will be the basis for conviction and sentencing in the future..."

Director Chen was very excited and spoke incoherently.

Han Bo basically heard what he meant and explained: "Director Chen, the structure of DNA is relatively stable, and the degradation rate is extremely slow in normal circumstances. The only factors that can affect it are temperature, humidity, pH value, oxidation reaction, enzymatic decomposition and microbial infestation.

The lightning tube we found on the site has indeed experienced explosions and high temperatures. But the short-term high temperature mainly causes DNA denaturation, that is, DNA double-stranded melting becomes single-stranded, and after the temperature drops, it will return to double-stranded form. The reason why I dragged it until this afternoon to extract and test is to completely restore its double-stranded form."

"You have long thought of extracting the dna on the tube?" Director Chen reacted.

"Yes, I wanted to extract the test from the moment I found the lightning tube. Considering that it is dangerous to extract the test material from the failed lightning tube, I decided to leave enough time for the suspect DNA that may exist on the lightning tube to restore the double-stranded form, and then extract it and test it in one go."

I have planned to extract and inspect the Xinyuan community, including micro-inspection instruments and equipment, are not so urgent.

I was deceived and was cheated of more than four million yuan in funds by this brat!

Director Chen was so angry that his teeth were itchy, but he could not criticize a hero who had just made great contributions to the investigation of the case. He secretly decided not to approve any application report in the next year regardless of how many times he made.

"Thank you for your hard work, arrange for someone to send the thunder tube to the dangerous goods warehouse, and then hurry up and rest."

"yes!"

...

There was an instructor and deputy captain. Han Bo didn't need to worry about how to deal with it. With Li Jiaqi and others helping him take off the explosive clothes, he went to the dormitory behind and lie down and fell asleep.

Cheng Wenming and Jin Yang, who have also worked until now, are still working in an office in the Development Zone Branch, working together to organize the materials for today's investigation, discussing the case in a word.

"I have seen several air conditioners today. It is not difficult to remove them. Just an ordinary screwdriver is fine and does not require special tools."

"Civilized, are you saying that the suspect is not necessarily an air conditioner sales, installation, and maintenance practitioner?"

"It is possible, or it may be disguised as an installation and maintenance worker."

Cheng Wenming put the sorted materials aside, took out a cigarette and lit them, and then said, "There are only four left that need to be investigated. Judging from the situation provided by the comrades in the branch, they all have legitimate occupations and have no criminal record. I feel that the possibility of him committing the crime is not high."

"Our task is to investigate them. As long as they have no problems, our group will have no responsibility." As soon as a rape and murder case was cracked, he was transferred to the 01.01 Super Blast Cases task force. Jin Yang has not had a good rest for many days, and he is exhausted both physically and mentally, looking very haggard.

The opportunity is rare. Director Han has such high expectations for him. Cheng Wenming didn't want to go back to Liangzhuang in shame. He looked up and asked, "Jin Da, what if the suspect is not within the scope of investigation designated by the command center for us, but is in the jurisdiction of the Development Zone Branch?"

"What do you think?"

"Air conditioners are not ordinary household appliances. They are not like TVs and electric fans. There are not many people selling, installing, repairing and recycling air conditioners in the city. After more than ten hours of investigation, the command center would notify us to stop. There is no news yet, which means that there is no breakthrough in the investigation work, at least we have not.

The suspect is unlikely to be a professional, but he can disassemble the air conditioner and put the bomb in it. This shows that he knows more or less. He has seen others repair or touched the air conditioner and external units with his own hands. Today I met some people who installed air conditioners, welding cages outside the external units, for fear that the external units would be stolen.

Can we start from this aspect and review all the stolen air conditioning external units of the police stations and criminal police teams of the branch to see if we can find any clues. No one can say that luck is right, maybe it can really gain something."

The remaining four people who need to be investigated go out to work. They are different from the suspects on other lines, especially the two lines of the Marine Engineering Group and the Second Construction Company. Just visit and ask and determine where they were before and after the incident. There is no need to chase and see people.

There is nothing to do next, just check it out.

Jin Yang weighed it and agreed: "I will visit and inquire tomorrow, and you will understand the stolen air conditioner unit."

"OK."

At the same time, "Lao Shuai" convened a meeting of the heads of the second, third, fourth and fifth groups of the task force in the conference room of the traffic police team.

The eighth group where Cheng Wenming and Jin Yang are located is equivalent to picking up the missing pieces and filling in the gaps. It is not the main force and has a "status" in the task force. The team leader does not need to participate in the case analysis meeting. He just needs to summarize the investigation materials of the three exploration teams to the analysis team.

"In the past three years, mobile houses have been rented out four times. The first time is to the Youth Community Construction Project Department of Donggang Construction Company, which took about six months. The second time is to a bridge construction group of the Road and Bridge Company, and the third time is to the Municipal Engineering Company, which is placed at the intersection of Qingnian Road and Jianshe Road. The fourth time is to the infrastructure construction site of the Ocean Engineering Group.

Because there are too many people to visit and ask, and it is the New Year's Day holiday, no abnormalities are found yet. However, I think the problem is most likely during the third rental period. The intersection of Qingnian Road and Construction was People's Square. Now there is a large flow of people, and there are also a lot of people during construction. The suspect wants to create a big explosion to achieve his ulterior motive. It is the most suitable place to detonate it there."

The old coach took a deep breath of cigarette and asked coldly: "How many people do you need to add?"

"Ten police officers, and ten more police officers should be enough."

"I will draw 15 of you to ask and investigate overnight. As long as you find a motive and time to commit the crime, you will immediately take a blood sample for examination."

"yes."

………………………………………

ps: During the Mid-Autumn Festival, several guests came to my home, and it has been delayed until now. I have been waiting for you for a long time. Sorry.
Chapter completed!