Survey laboratory.

Shen Yan is visiting the fruits of Lu Chuan's labor in the last six days.

"That's what you bred?"

At present, there are more than 50 petri dishes on the table.

Some of them seemed empty inside, and there was nothing.

Some of them are fluttering mob flies, while others are crawling with hemp fly larvae.

Lu Chuan nodded: "There is still an experiment that has not been completed, and the results should be available tomorrow morning."

"It's just ......"

"What's wrong?"

Although Shen Yan is a forensic doctor, she has also studied the basic theories of forensic entomology.

But it is the first time I have seen hemp fly larvae cultivated in petri dishes like Lu Chuan.

Lu Chuan shook his head: "Through the cultivation of hemp fly larvae this time, we can accurately determine the time of the first batch of hemp flies parasitic on the corpse."

"However, judging from the results so far, something is not quite normal, and the eggs seem to have been hatching for too long, as if they were ......."

Lu Chuan opened one of the petri dishes, and inside was a chrysalis, which was a larva about to hatch.

"It's like it's been refrigerated for a while!"

Lu Chuan discovered a strange phenomenon when he was cultivating hemp larvae.

The intergenerational relationship of these hemp fly larvae is very simple, they are all one generation of larvae.

In other words, the parasitic hemp fly larvae on the corpse do not hatch and then lay eggs.

This raises the question.

Lu Chuan collected DNA information from the collected hemp fly larvae.

Some of the hemp fly larvae were found to have homologous DNA, which is eggs laid by the same hemp fly.

But the development of these hemp flies is not the same, some grow big, some grow small.

This is not a common phenomenon in cadaveric parasites.

Unless in a closed environment, the body will be found by flies within ten minutes of death.

In other words, the time it takes for the fly to lay eggs is almost equal to the time it takes for the corpse to die.

This is also an important reason why forensic entomology exists.

However, the homologous larvae found in this corpse have a very large gap in growth and development.

The first batch cultivated by Lu Chuan had already pupated and turned into hemp flies two days ago.

But the small larvae are just over a centimeter now, and they are still about a week away from pupating.

Lu Chuan is now waiting for an intermediate result, so that the exact time can be determined.

It is a few larvae that are pupating, and through the time they pupate, a lot of important information can be calculated.

Shen Yan didn't know much about this, she only knew some basic theoretical knowledge.

"Listen to my master, Team Leader Ren Qiang and Team Leader Sun Jun are not going well?"

Lu Chuan nodded, he also heard about it.

"Brother Hui, they were in the early morning of the second day after the crime. I found the first scene where the murderer threw his body, and I went to do the current investigation."

"But there were very few traces left at the scene, and the heavy rain washed away everything, but it was found that the body should have been dragged and a shoe was left at the scene."

"Some of the hairs we've collected have been confirmed to belong to the deceased, and nothing else has been found."

"Team Leader Sun Jun has also conducted a detailed investigation based on the fact that the size of the clothes worn by the deceased did not match the size and figure of the deceased that you found."

"They're having a case analysis meeting right now, and they should be debriefing."

"But in the morning, I heard from Team Leader Sun that the situation is not optimistic."

Lu Chuan and Shen Yan came early in the morning.

On the way to the office, I met Sun Jun and chatted for a while, but I didn't ask for any special details.

It was only known that the search for the expensive underwear on the corpse had encountered difficulties.

Conference room.

"Can you contact the headquarters of this underwear company and check the purchase of this nationwide

Consumer information for underwear?"

Since Haizhou City has determined that there is no problem with people who buy bras of this style and size, let's start from the whole country.

Since only thirteen pieces were sold in Haizhou City, it is estimated that the national volume will not be particularly large.

Also, this luxury store does not have outlets in all cities.

It shouldn't be particularly difficult to look up.

"I'll try, the headquarters of this company is not in Haizhou, I'll contact the criminal investigation detachment over there to see if I can help."

Sun Jun actually thought about this method, but he was not sure if it could be successful.

But whether it can be found or not, it's hard to say now, after all, the sales of this underwear are not real-name.

The reason why the Haizhou City Criminal Investigation Detachment investigated so thoroughly is because this territory is Haizhou.

But even so, it took a week to figure it out.

And if this range is enlarged to the whole country......

Sun Jun had no confidence at all.

They had similar experiences before, but they didn't succeed without exception.

Qin Yong actually knew about this situation.

He came from the front line, and the cases he handled have also encountered similar situations that need to expand the scope of investigation.

But there are very few successful ones, but you can't stop checking them because the success rate is low.

Now among all the clues, this clue is more obvious, and you can only chase it.

Of course, the investigation of Sun Jun and others cannot determine who is the murderer just by a bra.

After all, even if you find all the people who bought this D-cup bra, you can't say that whoever loses the bra is the murderer.

Otherwise, Sun Jun would not have had to take more than 20 people to check in Haizhou for a week.

The meeting ended quickly.

Survey Office.

"How's it going?"

Lao Bai handed Liu Guodong a cup of hot tea and asked about the case analysis meeting just now.

Liu Guodong shook his head.

"Ren Qiang's side has already checked several surrounding villages, there are no missing people, there are no witnesses, the place where the murderer threw the body is too remote, and there are no people even fishing."

Lao Bai still has some experience of this.

A place where fishermen don't go, it's definitely off the beaten track.

"What about Sun Jun?"

"There is no result, the thirteen people in Haizhou City who bought that D-cup bra have all investigated and found nothing."

"Lao Qin is going to attack the whole country to see if he can find clues to the bra."

Nationwide?

Lao Bai shook his head when he heard this.

After so many years, the nationwide investigation is just talking.

One life will not use the resources of the whole country.

Moreover, the bra was inspected here.

There are no specific substances on it, and no hair or anything has been found.

Some of the crumbs also belonged to the deceased.

"If you want me to say that you have to start from the periphery, it is impossible for the murderer to throw the body silently, although it is far away, but it is not really no one?"

Janssen felt that it was better to start from the scene.

"It's not like you haven't been to the scene, there is no one living around, Ren Qiang and they have been checking for almost a week, isn't there nothing?"