"If it's not a student, who else could it be?" Ran Tao's eyes were as wide as lanterns, "It can't really be... a guard!? Could it be... I guessed it right again? Am I really that awesome?"
"God, you are a big-headed ghost! But... the doorman..." Zhao Yu said thoughtfully, "I have indeed considered this before. Well, only the doorman entering and exiting the dormitory building without anyone will arouse suspicion!"
"Of course..." Cui Lizhu said, "The doorman also has the key to the dormitory building!"
"Also," Zhao Yu added, "the doorman may have the key to each dormitory. When the students go to school, he can sneak into Liu Weiwei's dormitory quietly and read the manuscript he wrote!
"Liu Weiwei said that he often puts manuscripts on his bed...
"Perhaps, the guard accidentally saw his manuscript and was deeply attracted... "
"There are several storage rooms in Zhizhen Tower that have never seen the light of day. If he imprisoned the girl there, the outside world would have no way of knowing..." Ran Tao agreed, "Also, the most important thing is that, unlike the students, the guards will not know After graduation, I have to come and work every summer!
"No matter how you look at it, they are the most qualified!"
"I..." Cui Lizhu said, "Didn't we investigate the guard before? Where is the information?"
"It's with me!" After Zeng Ke answered, he searched for information and raised objections, "But... if it's a guard, the guard led a woman into the school. If someone sees it, wouldn't it be too obvious?"
"Tell me," Cui Lizhu said, "could it be that the murdered girls were not lured by the murderer, but were directly kidnapped by the murderer
"For example, is there an inconspicuous little door in the school that the guard has the key to? Can someone be kidnapped from there without arousing anyone's suspicion?"
"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, "The murderer must have a reason for killing. If it was a doorman, why would he do such a thing
“Furthermore, if deduced from the deformity theory, I feel that if the deceased were all college students, it might be related to the doorman!
“Because he saw female college students every day and felt envious, so he attacked college students!
"However, these victims are all members of society, and they may still work in special industries," Wu Xiumin said. "I feel that the theory of the doorman is a bit unreasonable!"
"That's right..." Cui Lizhu said, "The school's doormen, whether they are the ones who look after the gates or the dormitories, are usually very old people, right
"Do they have this ability? Even if they had this ability, they are so old. If they wanted to kill someone, would they have killed them long ago?"
"This is purely your subjective imagination!" Zeng Ke said, "Who said the doormen must be old? When we were in college, the doormen were all young..."
"Nonsense, the police college you went to was staffed by armed police soldiers. Of course they are young!" Cui Lizhu stuck out her tongue, "I think you just wanted to show off that you went to college!"
"..." Zeng Ke was speechless.
"It's useless to just talk, let's speak with facts!" Ran Tao opened the security information that Zeng Ke found, and was stunned after just one glance, "Isn't it? So much?"
"Yes!" Zeng Ke said, "There were no security companies at that time, and all the guards were hired by the school themselves. There were all kinds of guards, including those who came under a trust relationship, and some who occupied their positions and did not work. , and there is something unexpected happening at home...
"So the mobility was very high and there were many positions. In the years when the crime occurred, there must have been at least a hundred before and after, right?"
"You're stupid!" Cui Lizhu patted Ran Tao, "You do have an overall view of the situation. You can only look at the gatekeepers of Zhizhen Tower. Can there be 100 more? Hmm... um..." After taking a few glances, , it was Cui Lizhu's turn to be depressed, "This... what is this?"
"Why not mark the working location of the doorman? Can't you tell who is on duty at the Zhizhen Tower?"
"Yes," Zeng Ke said with a pout, "I'm afraid we have to let the school find a solution! It's a miracle that we can find these records through the ledger. Don't forget, it's been more than twenty years!"
"In that case," Zhao Yu said to Zeng Ke, "then contact the school, find the guard at Zhizhen Tower, and then compare it with the DNA found on the body bag!
"Forensic doctor Zhang said that based on DNA judgment, the suspect is a male and the doorman is also a male, so the suspicion cannot be ruled out...
"Moreover, the guard is familiar with Zhizhen Building and the school, and has many keys. The suspicion of committing the crime is indeed quite high! We need to focus our investigation in this direction!"
"Yes!" Zeng Ke and others nodded.
At this point, this temporary case analysis meeting should have come to an end. Unexpectedly, just when 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 profile analysis of the suspect has come out. This person should be a native of Chengzhou, and is close to the Li family of Fengjun, Zhuzhou and Menxia generations. Based on the blood relationship, his possible surname is 41% Li, 23% Yang, 15% Ji, 11% Wu... and 8% other surnames... "
"Wow, it's really amazing. I can even figure out my last name!" Cui Lizhu exclaimed, "Thankfully, I washed my hands of others early!"
"You don't call it washing your hands in a golden basin," Ran Tao joked, "You call it "correcting evil and returning home, right?"
"In this case," Zhao Yu said to Zeng Ke, "speed up and find out what the surname of the guard at Zhizhen Tower is first?"
After saying that, Zhao Yu opened the list of janitors and began to look at it carefully. Unfortunately, the list was a salary slip and did not show the age of the janitors.
So, Zhao Yu asked Zhang Peipei: "Forensic Doctor Zhang, can we determine the suspect's age at the time through his DNA?"
“It’s difficult,” Zhang Peipei said, “Our current method is to observe the repairability of 8-OHdG, because as people age, their DNA repair ability gradually decreases!
“Also, you can make a rough judgment based on the overall methylation level of DNA and the length of telomeres, etc.!
"However, all current research methods are not applicable to our situation, because the DNA we extracted is not fresh. If we conduct experiments, there will be huge errors and full of uncertainties!"
"Oh, I understand!" Zhao Yu nodded, "You said so many professional terms, but you just wanted to tell me two words - no!"
"..." Zhang Peipei was speechless and blushed.
"But it doesn't matter. At least we have conclusive evidence," Zhao Yu said. "The big deal is, if we compare it with more than a hundred security guards, I don't believe we can't find the suspect!"
(End of chapter)