After the task was assigned, Liu Qing, He Liang, and Song Zhiyi, who rushed over, went to find the organizers of the cross-country race on May 12 according to the information they found on the Internet to understand the relevant situation.

Xiao Ran and Zhang Lei together prepared to go to Wanggong Mountain again to investigate the scene.

But just as he was about to leave, Yu Yu chased after him with the forensic box, "Vegetable market, go to the vegetable market first! I'll buy something and put it on the spot for experiments." ”

"What do you buy in the vegetable market? If you do experiments, what do you have in the laboratory, and you have to go to the vegetable market to find it?" Zhang Lei turned to the vegetable market and asked puzzled.

"Meat, we don't have meat in our laboratory!" Yu Yu said, sighing resentfully: "It's a pity, I finally went to the vegetable market, and I couldn't eat the meat I bought......

"You bought the meat to test those fly larvae, right?" Xiao Ran asked, looking out the window.

"Yes, yes. Yu Yu chick nodded as if pecking rice, happily took out a medium-sized ziplock bag from the box, and kept shaking it in front of Xiao Ran: "Look at you!"

Xiao Ran turned his head, and immediately saw those fresh fat maggots that were about to hit his face, clumped in the ziplock bag!

"I'll go, what are you doing with these?!" Rao is Xiao Ran has always had an excellent psychological quality, and he was also startled when he saw these dense little things that were about to hit his face.

Zhang Lei, who was driving, also shouted when he saw this: "You perverted girl, you go to the vegetable market and take these things with you, it's not disgusting!"

"I'm not bringing this to help you solve the case!"

Yu Yu glanced at Zhang Lei, pointed to the fat maggots in the bag, and explained: "These are the best-developed larvae I picked from the corpse of the deceased, and after my observation yesterday, there were no pupae that had broken their shells at the scene, which shows that these maggots on the deceased have not turned into flies." ”

"And then?" Zhang Lei grinned, forcing himself not to look at the things in Yu Yu's hands, otherwise he might vomit in the car from the breakfast he just ate!

O maggots plucked out of the dead!

That's why this girl can do this.

Thinking of the dense situation on the deceased yesterday, Zhang Lei's scalp was numb, especially when he thought:

——In the middle of the night, Yu Yu looked down at the corpse, carefully picked out such a cloud of maggots one by one with tweezers, and then raised his hand to shake the soft insects, and said with a smile 'perfect'!

I can't think about it, I can't think about it......

"We did a study last year, and we know that maggots are the most common in the destruction of corpses by insects, and flies are very sensitive to corpse odor, and sometimes they can even gather on the surface of the organism and start laying eggs during the dying period before the organism is completely dead.

After hatching, the eggs secrete a fluid containing proteolytic enzymes, which are first digested and destroyed, which is the soft tissues of the corpse, and the fat in the abdomen is preferred, and then invades the subcutaneous muscles and internal organs.

The most common local fly species, in summer, the fly eggs can generally hatch into larvae after 12~24 hours, and then turn into pupa after 5~7 days, and the pupa breaks into flies after 3~5 days. ”

Yu Yu put the larvae in the bag back in, "These are the best developed batch of larvae, I put them on the site with the meat, and it will take a few days to observe them regularly to become flies."

After determining this time difference, I cultivated two sets of fly eggs outdoors and in the laboratory, compared the time it took for the eggs to grow to the larval state, and then calculated after eliminating interference factors, I was able to obtain a more accurate time of death. ”

"Admire and admire, although I don't understand what you say, but I think it's so powerful!" Zhang Lei joked.

Xiao Ran had been silently listening to Yu Yu's experimental idea, and suddenly asked, "But if you do this, won't it take a long time?"

"It's going to take ten days and a half months. ”

Yu Yu thought for a while and said, "But this is a back-up experiment, just in case." In case you can't figure out the situation in a short period of time, I may be able to help you a lot with the results of my experiments. ”

"But you know, our Xiao Ran has always handled cases very quickly, in case you haven't come out yet, we have already solved the case, aren't you working in vain?" Zhang Lei said with a smile.

"It's better to work in vain than if you ask me for data and I can't get the results, right?"

Yu Yu didn't care, but after thinking about it again, he looked at Xiao Ran and said, "Yes, I haven't seen a case in your hands that has been in your hands for more than half a month." - Hey, if you're going to make me work for nothing, you'll have to treat me to dinner!"

"What do you mean by me making you work in vain? I'm not a god, and besides, I can't handle the case alone, and I don't have to rely on your help. ”

Xiao Ran glanced at Yu Yu, "But listening to what you said, it's quite pitiful, so be it, if the case can be solved before the results of your experiment come out, I will treat you to a big meal, the kind with a lot of meat!"

"That's it!" Yu Yu cheered.

While talking, Zhang Lei drove to a vegetable market on the way, and the vegetable market was crowded in the morning.

Yu Yu wasted a lot of effort to pick a large piece of fat and lean pork, and then asked the shopkeeper to divide the meat into three pieces, and then returned to the car and went to the scene of Wanggong Mountain.

On the side of the road at the foot of the mountain, an assistant police officer dozed off in the car, Zhang Lei parked the car side by side, and went straight up the mountain without alarming the assistant police in the car.

Next to the mountainside cordon, there was also an assistant police officer guarding the scene, and the three of them greeted him and crossed the cordon and brought into the scene.

I have to say that the atmosphere at the scene during the day was much better than last night, and after the body was removed, after a night of air flow, most of the stench dissipated, only a slight stench remained in the pit.

After helping Yu Yu to the bottom of the pit, Xiao Ran and Zhang Lei began to survey the periphery of the pit again, their attention was near the pit last night, and this time they wanted to expand the scope of investigation and search.

With the place where the deceased fell as the center of the circle, Xiao Ran and Zhang Lei spread out, and the shrubs and weeds near the edge of the pit were all trampled on yesterday, and it was quite easy to check, but further away it was overgrown with grass and trees, so they could only remove the weeds and shrubs little by little and check them carefully.

"There is a discovery! Xiao Ran, come and see!"

There was a shout from Zhang Lei's side, and Xiao Ran immediately walked over, only to see a cyan stone the size of two steamed buns, cobble-shaped with many edges, quietly embedded in the soil by the grass.

The most important thing is that there are mottled blood stains on one side of this stone, and there is a faint bloody handprint on the other side!

After Zhang Lei took out the camera to take pictures, he carefully put the stone into the physical evidence belt, and said excitedly: "This must be another murder weapon, the deceased's finger may have been broken by this stone, and the murderer's fingerprints may be extracted from it!"

Xiao Ran nodded, looking at the small pit left by this stone on the ground, "It should have been thrown by the suspect after committing the murder." ”