Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

At 10:30 in the evening, Lu Chuan's trace evidence analysis was finally completed.

However, the result was not ideal.

Most of the biological traces extracted from the deceased's shoelaces contained DNA information.

After comparison, it was a complete match with Sun Hao's DNA information.

In other words, although someone, most likely the murderer, had tied Sun Hao's shoelaces, the other party did not leave his own 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 likely to belong to Sun Hao.

Surveying the office now.

Seeing that Lu Chuan had finished the experiment, Liu Guodong and the others hurriedly inquired.

"Xiao Lu, what's the result?"

"No, the biological traces extracted from the shoelaces belonged to the deceased Sun Hao himself, and nothing was found in particular."

Lu Chuan's answer disappointed everyone, but this is actually the norm.

Theoretically speaking, since the murderer has touched Sun Hao's shoelaces, there must be substances left by the murderer on it.

This is an objective law, which cannot be changed, but there are differences in the amount of material left over.

Although Lu Chuan did trace evidence collection, it was impossible to collect all the substances on the shoelaces.

The current result is the worst result.

"Now we can only hope for fingerprints."

fingerprint……

The three of Liu Guodong sighed in unison.

One can imagine the difficulty of identifying and analyzing the fingerprints collected on shoelaces.

The laces on the sneakers that Sun Hao wears are flat instead of round.

If the shoelaces are cylindrical...

It is basically impossible to do identification analysis.

Lu Chuan drank a few sips of water, did not rest, and became busy again.

The width of the shoelace is less than half a centimeter, and the collected fingerprints are only one-third the size of normal fingerprints.

Not only that, these fingerprints were severely crushed and deformed due to the hard tying of the shoelaces.

When Liu Guodong and the three were dealing with it just now, they felt that they had no way to start.

However, in Lu Chuan's hands, it might just take longer.

Since acquiring advanced fingerprint identification and analysis skills, Lu Chuan has compared and analyzed a large number of fingerprints and has rich experience, so the fingerprint processing is very fast.

There are a total of five broken fingerprints, and it took less than an hour to complete the preprocessing.

"Let's see if we can get something out of it now."

In the system, the five fingerprints are compared one by one.

Ding!
Soon, the notification that the comparison was successful sounded.

"It's done?"

The three of Liu Guodong hurried over.

If it can be compared, it means that the collected fingerprints are effective.

Of course, the result is not necessarily the best.

The successful comparison was Sun Hao's own fingerprint.

Ding!
The second fingerprint is still Sun Hao's.

Ding!
The third fingerprint was Sun Hao's.

Several people held their breath and waited quietly.

There are a total of five fingerprints, if they are all Sun Hao's, then the clue of the shoelace is completely broken.

Ding!
The fourth fingerprint is still Sun Hao's.

Only the last one left!
Ding!
The four of them stared wide-eyed and held their breath.

Sun Hao!

It's still Sun Hao!

All five fingerprints belonged to Sun Hao.

Lu Chuan's tense nerves suddenly relaxed, and he leaned back on the chair.

"Sure enough, the comparison is still not successful."

In fact, when Lu Chuan was doing trace evidence analysis in the underground laboratory and found no biological traces of other people, he already had a hunch.

The fingerprint comparison is likely to be unsuccessful.

Because if the murderer wore gloves and tied Sun Hao's shoes, he would not leave biological traces or fingerprints.

Conversely, if the killer was not wearing gloves when tying his shoelaces, the fingerprints would also leave a biological trace.

The two are complementary, and if one discovers something, the other should also discover it.

What is happening now is the worst-case scenario. There is no result in the analysis of trace physical evidence, and there is no result in the analysis of fingerprint identification.

"Is there no other way now?"

Yang Sen sighed. In the recent cases, there were basically major discoveries in current investigations.

But this time, the micro-forensic analysis did not get the desired results, and the fingerprint identification analysis also did not get the desired results.

How to do?
It seems that all the work that can be done here has been done.

"Our side...maybe that's it."

Liu Guodong shook his head.

Current survey is not a panacea, nor can it play a decisive role in any case.

Of course, in this case, the role of the current survey is actually very important.

The determination of the nature of the case is the question raised by Lu Chuan.

The suspicious points on the shoelaces also proved 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 go to bed first, I'll give a brief report to Team Qin."

Lu Chuan and the others nodded and left the computer.

Lao Bai lay on the sofa, Yang Sen and Lu Chuan opened the two camp beds and lay down on them.

Qin Yong's office.

"The test results of trace physical evidence on the shoelaces are all biological traces of Sun Hao himself, and the fingerprints are also left by Sun Hao himself."

"Now, there is basically no need to follow up on clues in this regard."

Liu Guodong roughly reported the situation.

Qin Yong leaned on the back of the chair, and it took him a while to speak.

"This murderer is very cautious."

Liu Guodong nodded, such murderers are rare.

So clean and neat, either he is a habitual murderer with 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 were not available to ordinary people.

"It has been investigated by people, but there is no result yet."

This is of course an important direction of investigation, and the murderer does 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 accidents, no one will do an autopsy on the body.

So, looking at it now, there is an advantage that the murderer may not know that his plan has been exposed.

"Okay, Lao Liu, you have worked hard, go back and rest first, maybe there will be good news tomorrow."

Liu Guodong didn't talk much, and returned to the current survey office after staying for a while.

Lu Chuan was lying on the camp bed, chatting with Shen Fayi.

"Trace physical evidence was not found, and the fingerprints were not successfully compared."

"It's okay. The murderer planned the murder so carefully. It's normal not to leave these details. Don't think too much."

Forensic doctor Shen has already gone home, and they will be fine after the autopsy.

Lu Chuan shook his head, adjusted his mood, and stopped talking about the case.

"Why haven't I seen your post on Moments in the past few days?"

Shen Forensic has the habit of often posting to Moments, but the last two days have been empty.

"I posted it, but today's photo is not very good-looking, so I deleted it, and then I forgot it when I got busy."

Oh?
Ok?
deleted?

Lu Chuan jumped up from the camp bed.

Yang Sen who was next to him was so scared that he almost fell off the bed.

"Xiao Lu, what's the matter?"

"Mobile phone! Brother Yang! Where is Sun Hao's mobile phone?" (End of this chapter)