With excitement on his face, Liu Yongxin kept waving his hand to a small criminal policeman beside him, signaling him to call someone quickly.

"Call people in the intercom, and let all the people from the technical department come over."

The little criminal policeman nodded hurriedly, and repeated what Da Zhao said towards the intercom, and after a while, everyone ran over, Liu Yongxin gasped, squatting next to Da Zhao.

"What did you find?"

"Footprints, although the footprints are incomplete, but this pattern is too special, I think it is the same as what was found in the Xiaoqu flower bed, and look at this position, this kid's eyes are very good, he said that it is a pit of urine, I found that it is indeed like, Uncle Liu, take a look, according to the position left by the footprints, this person should be facing the direction of the hillside to pee."

Lao Yang also squatted down, took off the mask, and sniffed it closely.

"It's really urine, this person is very strong in urine, there was originally dry grass here, and it was all washed away."

Liu Yongxin looked at the distribution of footprints, learned to squat, and he realized:

"This person squatted down to pee in order to avoid sound and make it easier to hide, so part of the dry grass was washed away, and the vision was not good at night, he didn't find it, as for the footprints, compared with the flower beds in the community, I think even more that this person is more than 180 tall, otherwise he wouldn't do so."

"Uncle Liu, then continue to search?"

Liu Yongxin waved his hand and turned to look in the direction of Qinda Road.

Looking at this position, there is just a stone in front of it, which is a perfect shelter to reduce the spread of flavor, Liu Yongxin suppressed the surprise in his heart and waved his hand to the people around him.

"From here to the location of the rock, we searched for the traces of broken branches, and footprints, and even cigarette butts, garbage, and all the traces, and I think we are close to the position where the murderer is crouching, and that stone is the perfect place to look."

Da Zhao nodded, and hurriedly called Sun Gaotie to come over, eager to use a magnifying glass to carefully observe everything below, one by one small flags were forked, Fang Mu and they all ran over, Liu Yongxin held a magnifying glass and knelt on one knee.

There are seven footprints on the ground, and the sense of direction and rubbing are retained, and Liu Yongxin carefully analyzed them.

"This person's size 44 shoes, based on the pace, depth of footprints, etc., are between 180-185 in height, the outside of the left heel is severely worn, and the right foot is weight-bearing, according to normal speaking, most people are right-footed weight-bearing, but this person's left foot is unilaterally worn and worn, I think this person can be considered left-handed.

In addition, there is an old injury below the knee joint of the left leg, resulting in knee valgus, and fast walking limits movement, forming a compensatory step, which may not be detected during slow walking and running, but the existence of leg injury will be clearly felt when the foot is moved quickly or horizontally, without control. ”

Da Zhao leaned over excitedly.

"Find a urine sample, this person still has a little problem with his left leg, isn't it closer to the truth, and then look to see if there are any clues left?"

Saying that, Liu Yongxin was helped up, and several people walked behind the stone, Yang Xuetong and Wang Jianjian had already climbed up, and the driver Lao Wang, who was not far away, picked up a cigarette butt folded into an L-shape with tweezers, and the cigarette burned two-thirds, and the remnants of the head were pressed and piled up into a lump.

Look at the location of the stones, and take a closer look at the logo on the cigarette butt.

"Zhao Zhenjian, look at this cigarette butt, I think it was left by someone standing on the stone, pinching the cigarette butt and extinguishing it, and then flicking it with his fingers, there are tooth marks on it, maybe you can find fingerprints."

Da Zhao climbed a handful and a half of stones, hurriedly came down and walked to the driver Lao Wang, put the cigarette butt in the physical evidence bag, and handed it to Liu Yongxin.

"I found it, I should have pressed it here to extinguish it, and then threw away the cigarette butt, Uncle Liu is not a professional killer, how could he leave such a thing?"

Liu Yongxin had already raised the cigarette butt and looked at it carefully, with a hint of realization on his face.

"It's true that people are professional, but I think the tobacco he smoked was overfrequented, and it looks like a normal Huazi, but there are pinholes in the position of the mark under the cigarette butt filter, a person who is so decisive and can lurk for several hours without leaving a trace, can leave such a thing, either to restrain the pain, or to have a D addiction attack and take the initiative to smoke."

Da Zhao nodded, his small eyes widened.

"Uncle Liu, in this way, this person is related to Fang Shengping's case, when we found Zhang Meng, the waiter who was hidden by Liu Liwei, she smoked cigarettes with such ingredients, and the brand injection position was all the same."

"Not necessarily, put things away, look for any other residues, if not, just look around the stone for the path of this person's down."

Needless to say, several people moved, Fang Mu shouted at everyone, and stood by for the time being, after all, such a detailed survey is still done by professionals more carefully, and being able to have a direction is already the biggest gain.

After a while, after the search was completed, they followed Yang Xuetong and Sun Gaotie, who opened the road in front, and they found a downward path, which is a ditch-like area at the eastern foot of Fushan Mountain, with few weeds on the ground, all gravel and gravel, and not many footprints, and it can be regarded as the location that can reach the middle of the two communities recently.

After arriving at the bottom of the mountain, the footprints found again were also photographed, after collecting traces, Da Zhao shouted on it, let everyone dodge, he carried the survey box, pressed the timer, ran down from it quickly, rushed to the parking strip of the two communities, glanced at the time, and it only took more than 90 seconds.

Wheezing, Da Zhao looked at Liu Yongxin.

"Uncle Liu, the time to come down here is shorter than we guessed, without carrying a suitcase, I think even if I carry a bag, I can come down in a minute, from here to the south side of the villa, climb over the guardrail to enter, and arrive at the flower bed, it takes up to three minutes.

Zhou Xiaozhou didn't drive fast, he drove up from the intersection of Qinda Road, found a parking space, and then returned home, which took ten minutes to start, it seems that the murderer has already figured out Zhou Xiaozhou's habits, and there is plenty of time to prepare. ”

Liu Yongxin nodded.

"It seems that we have found the location of the suspect's ambush, this is not enough, he did not appear in the surveillance after the injury, so is it the same way up the mountain, avoid the crowd and surveillance from the mountain, and then find a means of transportation to leave?"

Liu Yongxin's guess can be described as bold, but Zhao Xinli and they nodded after listening.

"Indeed, if you want to leave the campus, I don't think it's possible, and after Lao He found Zhou Ning, he sent him to the hospital and called the Xu Bureau to inform him that someone arrived here on duty immediately, and wanted to flee the scene unnoticed, and he was not photographed by the surveillance.

He has only one path, that is, to return to the lurking point the same way, and then go up the mountain retrograde, from here to the north over the floating mountain, if the physical strength is good, you can go directly to Jinsong 3rd Road, where you can find a place to park, you can also leave quickly. ”

Liu Yongxin nodded.

"Tell Xiaoqu what you think, you can find all the surrounding surveillance, of course, it is not limited to the road at close range, Da Zhao's idea is indeed possible, but don't forget one point, the murderer is not good on one foot, this squatting guard is not affected, but I am afraid it will still be difficult to climb the mountain."

Da Zhao was silent, Liu Yongxin patted him on the shoulder, at this time, he couldn't discourage everyone's enthusiasm, and quickly exhaled and said:

"Zhou Ning, the traces left by the arrows on the door of their house, have all samples been collected?"

"Well, it's been collected, but the test results haven't been seen yet."

"That's good, let's leave."

In the laboratory on the fourth floor of the technical department.

Peng Shinian kept typing on the computer, Xiaoqu watching his input and staring at his notebook.

Liu Yongxin and the others entered the room, neither of them noticed, and when they walked to the side, Peng Shinian suddenly found someone approaching, which scared him and made him tremble, and a stack of papers next to him fell to the ground.

Liu Yongxin picked it up and looked at it twice, it was all in English, and there was a picture marked in English.

"What's the progress on your PSP?"

Xiaoqu came over with a smile, obviously very excited.

"Needless to say, the process is very cumbersome anyway, but we found through several reports, as well as a comparison between the fishery department and the health department, that there is a marine biology laboratory in Xinghua, which used to be a branch of the biological laboratory of Qindao Ocean University.

Over the past year or so, they have collected a large number of samples of Ezo scallops, and they have purchased up to 23 tonnes from the three high-PSP scallop sources mentioned in the previous report.

Moreover, 99% of these raw materials they purchased are glandular parts of Ezo scallops, and only a small amount of whole Ezo scallops are only used as retention samples, which can be analyzed according to the equipment reported by their laboratory to complete the extraction of PSP. ”

Da Zhao blinked, his mind estimating the weight.

"23 tons, 23,000 kilograms, a laboratory uses such raw materials, how many trips does it take to pull scallops? This has to be shelled, so much scallop meat needs to be processed, can a laboratory do it? ”

Peng Shinian shook his head, his face excited.

"It sounds like a lot, but in fact, the content of scallop meat in 23 tons is less than one-tenth, and we estimated that it was calculated according to 2,300 kilograms, which is not all used for extraction, after all, PSP is mainly found in the glands of Ezo scallops.

The glands account for about 1/12 of the meat, that is, 191 kilograms, and the general laboratory can do the extraction, and this procurement is not completed at the same time, after all, this is not artificially cultivated, and the collection season is between June and December last year. ”

Liu Yongxin interrupted Peng Shinian's words, he knew that Peng Shinian was an academic, and finding these things was more exciting for him, and what he wanted to know was not this.

"Xiaoqu checked this laboratory, who is in charge? Are they a branch of Kotoshima Maritime University, or what? ”