"If it weren't for a student, who else could it be?" Ran Tao's eyes were glaring like a lantern, "It's not really... the guard, right? Did I guess it right again? Am I really so amazing?"

"God, you big-headed ghost! But... the guard..." Zhao Yu said thinking, "I have indeed considered this before. Look, only when the guard enters and exits the unmanned dormitory building will not arouse suspicion!"

"Of course..." Cui Lizhu said, "The guard also has the key to the dormitory building!"

"Also," Zhao Yu said again, "The guard may have the key to every dormitory. When the students go to school, he can sneak into Liu's dormitory and read the manuscript he wrote!

"Liu Yiu said that he often puts manuscripts on his bed...

"Perhaps the guard saw his manuscript accidentally, and then he was deeply attracted..."

"There are several storage rooms that are not visible to the sky. If he imprisoned the girl there, the outside world would have no way to know..." Ran Tao echoed, "Also, the most important thing is that the doorman is different from the student. He will not graduate and has to come to work every summer vacation!

"No matter from any aspect, they are the most qualified!"

"I..." Choi Lizhu said, "Haven't we investigated the doorman before? Where is the information?"

"It's here!" Zeng Ke replied, while searching for information, he raised objections, "But... if it was a doorman, the doorman took a woman into the school. If someone saw it, wouldn't it be too obvious?"

"You said," Choi Lizhu said, "Can those girls who were killed be not lured by the murderer, but were directly kidnapped by the murderer?

"For example, what inconspicuous small doors in the school? The guard has a key? From there, it will not arouse any doubts?"

"Well... this problem is not difficult to solve," Ran Tao nodded, "just ask the school and you will know!"

"But... why?" Wu Xiumin suddenly said, "There must be a reason for the murderer to kill people. If it were the gatekeeper, why did he do such a thing?

"And, if deduced from the theory of deformity, I feel that if the deceased were all college students, it might be related to the guard!

"Because, he sees female college students every day and becomes envious, so he attacks the college students!

"But these victims are all social workers, and they may still be in special industries," said Wu Xiumin. "I feel that the theory of doorman is a bit unreasonable!"

"Yes..." Cui Lizhu said, "The school guards, whether they are looking at the gate or the dormitory, are usually very old people, right?

"Do they have this ability? Even if they have this ability, they are so old. Do they have to kill someone long ago?"

"This is purely your subjective imagination!" Zeng Ke said, "Who said the guard must be old? When we were in college, the guards were all young..."

"Nonsense, the police university you went to, and the soldiers on guard were all armed police. Of course they are young!" Cui Lizhu stuck out her tongue, "I think you are just showing off your college entrance examination!"

"..." Zeng Ke was speechless.

"It's useless to just say it, let's talk with the facts!" Ran Tao opened the security information found by Zeng Ke, and was stunned after just one look, "No way? So much?"

"Yes!" Zeng Ke said, "At that time, there was no security company. All the guards were self-employed by the school. The guards were all kinds of, all kinds of, some were entrusted with connections, some were occupied and not working, and some suddenly had something to do at home...

"So the liquidity is particularly large and the location is large. In the years when the incident occurred, there would have to be at least one hundred of them?"

"You are stupid!" Cui Lizhu patted Ran Tao, "You have a big picture. Isn't it enough to just look at the guards of Zhizhen Tower? Can there be 100 more? Well... um..." After a few glances, it was Cui Lizhu's turn to be depressed, "What's this... what's this?

"Why don't you mark the working position of the doorman? Can't you tell who is on duty in Zhizhen Building?"

"Yes," Zeng Ke said pouted, "I'm afraid the school has to find a way! It's already a miracle to be able to find these records through the account book. Don't forget that it's been more than twenty years!"

"Since that's the case," Zhao Yu said to Zeng Ke, "Then you go and contact the school, find out the guards of Zhizhen Building, and then compare them with the DNA found on the body bag first!

"Forensic Zhang said that according to DNA, the suspect is a man and the doorman is also a man, so the suspect cannot be ruled out...

"Also, the guard is familiar with the situation of Zhizhen Building and the school, and there are many keys. The suspect is indeed quite serious! We need to focus on this direction!"

"Yes!" Zeng Ke and others nodded.

Speaking of this, this temporary case analysis meeting should come to an end. Unexpectedly, just as everyone was preparing to work, a police officer sent a report to Zhang Peipei.

"This is..." Zhang Peipei opened the report and said, "The genetic spectrum analysis of the suspect has been released. This person should be a native of Chengzhou, and has a close blood relationship with Fengjun, Zhuzhou and Menxia generation Li family. His possible surname is 41% of the surname Li, 23% of the surname Yang, 15% of the surname Ji, 11% of the surname Wu... and 8% of the surname other surnames..."

"Wow, it's so amazing. You can even calculate the surname!" Cui Lizhu exclaimed, "Fortunately, Miss Jinbian washed her hands early!"

"You're not called Jinban washing your hands," Ran Tao joked, "Is it good to call you a turn from evil to the right?"

"Since that's the case," Zhao Yu said to Zeng Ke, "Please hurry up and see what the guard in Zhizhen Tower is first?"

After saying that, Zhao Yu opened the list of guards and began to check it carefully. Unfortunately, the list was a payroll, and the age of the guard was not shown on it.

So, Zhao Yu asked Zhang Peipei: "Forensic Zhang, can we judge the suspect's age by his DNA?"

"It's very difficult," said Zhang Peipei, "our existing method is to observe the repairability of 8-ohdg, because as people age, the repair ability of DNA is gradually declining!

"Also, a rough judgment can be made through the overall methylation level of DNA and the length of telomeres, etc.!

"However, all current research methods do not apply to our situation, because the DNA we extracted is not new in itself. If you do an experiment, it will cause huge errors and be full of uncertainty!"

"Oh, I understand!" Zhao Yu nodded, "You said such a lot of professional terms, but in fact, it's just to tell me two words - no!"

"..." Zhang Peipei blushed speechlessly.

"But it doesn't matter, at least we have decisive evidence," Zhao Yu said. "Best of all, compared with more than 100 safety-saving people, I don't believe that I can't find a suspect!"
Chapter completed!