There is no sterile laboratory in the Haizhou City Criminal Investigation Detachment, let alone Haizhou City, and there is no such laboratory in the province.

Fortunately, Lu Chuan does not need a sterile environment to cultivate these larvae, and ordinary petri dishes can do it.

When Shen Yan began to dissect the corpse, the investigation work of the front-line criminal police was also intensive.

Ren Qiang's group braved the heavy rain, starting from the place where the body was found, and traced all the way upstream to find the place where the body might have appeared in the first place.

"Several police stations around have already learned about it, and there have been no new cases of disappearances recently."

When an unnamed body is found, the first person to be investigated by the criminal police is usually the local missing person.

According to the degree of decomposition of the body, the time of death of the deceased can be initially delineated to about one month.

Zhang Hui focused on the information of missing persons during this period.

In terms of gender, height, clothing, etc., there is no similar information.

"Start with the clothes of the deceased."

Qin Yong has already obtained the preliminary results of the investigation of the corpse's clothing.

"There is a clear difference between the size of the deceased's underwear and the deceased's body, and this brand of underwear is relatively expensive, there should not be many stores selling this kind of underwear in Haizhou City, check it out and see if you can find anything."

The clues are not large, but it is possible to make further discoveries through this.

After all, there shouldn't be many people who can afford more than a thousand bras.

"How can the salvage team say that?"

After discovering the body, Ren Qiang immediately contacted the salvage team that usually cooperates.

"Lao Wu sent someone to go into the water to try it, the water level of the river has skyrocketed, the hydrological situation below is very complicated, and it is still raining, they expect to find nothing even if they go into the water."

Wu Jingzhong is an expert in underwater salvage and has cooperated with the criminal investigation detachment for many years.

Qin Yong thought for a moment and shook his head: "No, after the rain stops, we still have to let Lao Wu and them go into the water."

"The deceased apparently rushed down from upstream, and one of the shoes was missing, and there was a good chance that there was something else as the body came down."

"I really can't, expand the scope of the search."

Ren Qiang nodded, this is a strategic decision, only Qin Yong can make a decision in the detachment.

"Okay, I'll call him later, the weather forecast says that the rain will stop early tomorrow morning, and the hydrological environment should be less complicated by then, and it will be safer to enter the water."

"In addition, Liu Guodong just called, and the sharp knife found in the black plastic bag found at the scene was confirmed to be the murder weapon."

Yang Sen and Lao Bai had already extracted blood stains of the same blood type as the corpse on the sharp knife.

Although the wound could no longer be compared with the sharp knife due to the serious decay of the corpse, the blood type was the same, and it was also a sharp weapon stab wound.

Coupled with the proximity of the locations where the two were found, it can support the judgment that the sharp knife is the murder weapon. Look at the book

"Are there fingerprints?"

To solve a homicide, there are several important factors that must be known.

First, the identity of the deceased, second, the cause of death time, and third, the murder weapon.

Now, both the second and third factors have been found, and only the first remains.

"There are no fingerprints, Lu Chuan has already checked it, and the handle of the knife has been carefully wiped, leaving no traces."

"But there's a problem that's not quite logical."

"What's the problem?"

Ren Qiang got up and drew two parallel lines on the whiteboard.

"This is where the body was found, on the bank of the Blanc River, lying on the bank with its back facing up."

Ren Qiang drew a straight line again: "This is the location where Yang Sen found the murder weapon, and after measurement, the distance from the body is more than 50 meters, to be exact, 53.8 meters."

"The sharp knife has extracted blood stains of the same blood type as the rotting corpse, and the wound on the corpse's chest is also caused by a sharp weapon."

"Judging from the current information, it can basically be determined that this is the murder weapon."

Ren Qiang paused and pointed

"But the problem is that the black plastic bag containing the dagger was found to be more than 50 meters away from the corpse," he draws.

"So, how did the murder weapon get to this location?"

"River washing?"

Ren Qiang shook his head: "In the section of the Bailan River where the body was found, all the overflowing river water has invaded a distance of twenty meters from the land at the farthest."

"In other words, the plastic bag containing the murder weapon could not have been washed by the river."

"And where did this murder weapon come from?"

"Also," Ren Qiang picked up a photo, "This is the appraisal report made by the current survey."

"There wasn't enough blood on the knife to be tested, but Janssen extracted enough blood from the inside of the scabbard."

"Combined with the fact that the fingerprints on the handle of the knife were deliberately erased, it shows that the other party actually wiped the blade part of the knife when handling the handle."

"The reason why there are still blood stains is because there is no way to remove the blood stains inside the scabbard, or the murderer forgot to remove them."

That's pretty understandable.

After the killer had killed someone, he then inserted the knife back into its scabbard and wiped it down as he discarded it.

But there was still blood in the scabbard.

"What do you think?"

Of course, Qin Yong understood what Ren Qiang meant.

But what exactly does this mean behind that?

The body floated down the river, but the murder weapon was thrown down?

"I think there are two possibilities."

"First, the murder weapon was abandoned by the murderer, and after the murder was killed, the body was left to decay, and after the murder weapon was taken away from the scene, it was abandoned in the location where we found it."

"Recently, due to heavy rain, the body was accidentally washed into the river, and then it happened to be washed up on the shore where the murderer abandoned the murder weapon."

"You mean there was a murder weapon first, and then the corpse rushed over by accident?"

"Yes, the murderer may have been a murder weapon that was disposed of at will, and the body was coincidentally washed over by the Bailan River due to heavy rain."

"What about the second possibility?"

"Second ......"

Ren Qiang thought for a while, and shook his head again: "The murderer deliberately left the murder weapon near the corpse to provoke us?"

"Provocation?"

Qin Yong has been handling cases for so many years, and he has seen all kinds of murderers.

There are indeed some self-righteous murderers who feel that they are very smart and cautious, deliberately leave some clues, and play a game of hiding cats with the police.

"Yes, it's a provocation, after he killed someone, he let the body decompose, and after finding that the body was washed away by the river, he followed it all the way, and then the murder weapon was still at the scene."

"Of course, there is a time lag here, and when the other party abandons the murder weapon, it is before the arrival of the flood patrol officers."

"Tell us what you think."

"The first is a bit too coincidental, but it's not impossible, and the second is ...... What's the point of him provoking the police?"

"Yes, I agree with Lao Song's view that most of the general provocations are found in serial cases."

"After so many years, I haven't been able to encounter one or two cases, right?"