At half past ten in the evening, Lu Chuan's trace evidence analysis was finally completed.
However, the results were not ideal.
DNA information was mostly extracted from the biological traces extracted from the shoelaces of the deceased.
After comparison, it completely matched Sun Hao’s DNA information.
In other words, although someone, most likely the murderer, tied Sun Hao's shoelaces, the other party did not leave his biological tissue on the shoelaces.
In this case, it means that the other party is likely to be wearing gloves.
In this way, the broken fingerprints extracted from the shoelaces are also very likely to be Sun Hao's.
Now surveying the office.
Liu Guodong and the others saw that Lu Chuan had finished the experiment and hurriedly asked.
“Xiao Lu, what’s the result?”
"No, the biological traces extracted from the shoelaces all belong to the deceased Sun Hao himself. There are no special findings."
Lu Chuan's answer made everyone a little disappointed, but in fact this is normal.
Theoretically, since the murderer came into contact with Sun Hao's shoelaces, there must be substances left by the murderer on them.
This is an objective law and cannot be changed. It is just a difference in the amount of material left behind.
Although Lu Chuan collected trace evidence, it was impossible to collect all the substances on the shoelaces.
The current result is the worst result.
"Now we can only place our hope on fingerprints."
Fingerprints...
Liu Guodong and the other three sighed together.
The difficulty of identification and analysis of fingerprints collected on shoelaces can be imagined.
The laces on the sneakers Sun Hao wears are flat instead of round.
If the shoelaces are cylindrical...
It is basically impossible to do identification and analysis.
Lu Chuan took a few drinks of water and became busy again without resting.
The width of the shoelaces is less than half a centimeter, and the fingerprints collected are only one-third the size of normal fingerprints.
Not only that, these fingerprints are severely crushed and deformed due to the force of tying the shoelaces.
When Liu Guodong and the other two were dealing with it, they felt like they had no idea where to start.
However, in Lu Chuan’s hands, it might just take a little longer.
Since acquiring advanced fingerprint identification and analysis skills, Lu Chuan has compared and analyzed a lot of fingerprints and has rich experience, so the fingerprints can be processed very quickly.
A total of five broken fingerprints were pre-processed in less than an hour.
"Now let's see if we can gain something."
In the system, the five fingerprints are compared one by one.
Ding!
Soon, the prompt for successful comparison sounded.
“It’s done?”
Liu Guodong and the other two hurried over.
If they can be compared, it means that the fingerprints collected are effective.
Of course, the result is not necessarily the best.
The successful comparison was Sun Hao’s own fingerprints.
Ding!
The second fingerprint is still Sun Hao's.
Ding!
The third fingerprint belongs to Sun Hao.
A few people held their breath and waited quietly.
There are five fingerprints in total. If they are all Sun Hao's, then the shoelace clue is completely broken.
bite!
The fourth fingerprint is still Sun Hao’s.
Only the last one left!
Ding!
The four people stared wide-eyed and held their breath.
Sun Hao!
It’s still Sun Hao!
The five fingerprints all belonged to Sun Hao.
Lu Chuan's tense nerves suddenly relaxed and he leaned back on the chair.
“Sure enough, the comparison was still not successful.”
In fact, Lu Chuan already had a hunch when he found no biological traces of other people while doing trace evidence analysis in the underground laboratory. The fingerprint comparison is likely to be unsuccessful.
Because if the murderer wore gloves and tied Sun Hao's shoelaces, he would not leave any biological traces or fingerprints.
On the contrary, if the murderer did not wear gloves when tying his shoelaces, the fingerprints would also leave biological traces.
The two are complementary to each other. If one makes a discovery, the other should also make a discovery.
What is happening now is the worst-case scenario. The trace evidence analysis has no results, and the fingerprint identification analysis has no results either.
"Is there no other way now?"
Yang Sen sighed. In the recent cases, the current investigation has basically made major discoveries.
But this time, the trace evidence analysis did not get the desired results, and the fingerprint identification analysis also did not get the desired results.
What to do?
It seems that all the work that can be done here has been completed.
“This may be it for us.”
Liu Guodong shook his head.
Survey is not a panacea and cannot play a decisive role in any case.
Of course, in this case, the role of spot investigation is actually very important.
The determination of the nature of the case was the question raised by Lu Chuan.
The suspicious points on the shoelaces also prove that the victim did not die in a normal car accident.
"Okay, let's all take a nap for a while. After a long day, especially Xiao Lu, you can get some sleep first and I'll give Team Qin a brief report."
Lu Chuan and others nodded. Head away from the computer.
Lao Bai lay on the sofa. Yang Sen and Lu Chuan opened the two camp beds and lay on them.
Qin Yong's office.
“The trace evidence test results on the shoelaces are all biological traces of Sun Hao himself, and the fingerprints are also left by Sun Hao himself.”
“Now, the clues in this regard are basically There is no need to follow up."
Liu Guodong briefly reported the situation.
Qin Yong leaned on the back of his chair and spoke after a long while.
"This murderer is very cautious."
Liu Guodong nodded. Such murderers are rare.
To be so clean and neat, he is either a habitual murderer with extremely rich experience, or he is naturally cautious and thoughtful.
"Is it possible to trace the source of the drug?"
The indoleamine drugs found in the body of the deceased are not available to ordinary people.
"People have been asked to investigate, but there are no results yet."
This is of course an important direction of investigation, and the murderer may not necessarily know that his murder has been exposed.
After all, the car accident at that time was indeed a random car accident.
In most of these car accidents, no one will do an autopsy on the body.
So, looking at it now, one advantage is that the murderer may not know that his plan has been exposed.
"Okay, Lao Liu, you have worked hard, go back and rest first, there may be good news tomorrow."
Liu Guodong didn't chat much, and returned to the field survey office after a while.
Lu Chuan was lying on the camp bed, chatting with Forensic Shen.
“No trace physical evidence was found, and the fingerprints were not successfully compared.”
“It’s okay. The murderer planned the murder so carefully. It’s normal that he didn’t leave these details. Don’t think too much. ”
Forensic Doctor Shen has gone home, and there will be nothing wrong after they finish the autopsy.
Lu Chuan shook his head, adjusted his mood, and stopped talking about the case.
“Why haven’t I seen you post on WeChat Moments in the past few days?”
Forensic Shen has the habit of frequently posting on WeChat Moments, but in the past two days, it has been empty.
“I sent it, but today’s photos didn’t look very good, so I deleted them. Then I got busy and forgot about them.”
oh?
Huh?
Deleted?
Lu Chuan jumped up from the cot.
Yang Sen next to him was so frightened that he almost fell off the bed.
"Xiao Lu, what's wrong?"
"Mobile phone! Brother Yang! Where is Sun Hao's mobile phone?" (End of this chapter)