Using the principle that objects of different properties and different levels have different reflectances of different wavelengths of light, the police have developed many reconnaissance lights of different wavelengths for different kinds of target traces.
For example, blue light survey lights are mostly used for the investigation and discovery of fingerprints, dust and sweat footprints, sperm spots, saliva spots, etc. carried on smooth objects and flat ground.
Soon, they found a stain on the concrete floor that had long since dried up.
Cheng Wei immediately took the survey box, carefully drew some distilled water from the bottle with a dropper, dripped it on the mark, soaked and dissolved the mark, and then took a small piece of absorbent gauze and carefully covered it with tweezers.
Finally, he put the gauze dipped in the stains into a sterile test tube, handed it to Yu Chen, and said, "Team Yu, the extraction is complete, you can go back and hand over the gauze to Xiao Zhou for identification." ” "Hmm."
Yu Chen's jaw was bowed.
The two of them are at the scene at this time, and they really can't help much, and besides, the identification of this kind of biological marker has a timeliness and has to be sent back for identification as soon as possible, so they really don't plan to stay at the scene any longer.
So, the two of them relayed the clues they had just learned to Cheng Wei, asked him to corroborate each other during the trace inspection, and drove back to the detachment.
Criminal Investigation Detachment, in the basement, Zhou Qianxin was typing a report, humming a song in the middle.
"There is a possibility of being bent in an instant" As soon as Yu Chen walked in, he heard this song, his face immediately darkened, and he asked speechlessly: "Xiao Zhou, what the hell are you singing?"
"Ah" Zhou Qianxin blinked her eyes and asked a little innocently: "A million possibilities, Team Yu, haven't you heard this song or can't sing it?"
"Poof" Yuan Youchong didn't hold back, and said: "Nine times out of ten, this guy thinks that there are a million possibilities as the possibility of being bent." ” Zhou Qianxin was stunned, and couldn't help but complain: "Team Yu, I didn't expect you to be like this" "Rolling" Yu Chen blushed and had a thick neck.
Yuan Youchong waved his hand, took out a test tube, and said, "Leave this rotten man alone."
Xiao Zhou, I want you to help with something.
We were at the scene and found a spittle from the suspect, which may also be a sputum scar, so you can quickly identify it and make an identification report. ” "Hey, okay."
Zhou Qianxin bowed her head and took the test tube.
After thinking for a while, she continued: "The biggest significance of the saliva spot test is to determine the blood type and gender of the suspect, and it can also determine the ABH secretory and non-secretory type. ” "As for DNA identification, it depends on luck, if there are oral epithelial cells in it, and the cell structure is intact, it can be extracted, but if there are no cells, or the cells have been disintegrated under autolysis, then there is no way."
"yes, I know."
Yuan Youchong nodded and said, "Let's identify it first, it's naturally best to be able to detect DNA and draw a genetic map, even if it doesn't work, it's an important clue." ” "Well, that's good," Zhou Qianxin said, "I'll give you the results in an hour, and if you can extract DNA, you can give a genetic identification report in about three to four hours." ” "Okay."
Yuan Youchong said: "If there is a result, you can call me or Lao Yu."
Well, by the way, what are the results of this morning's survey?"
"The genetics lab hasn't given the results yet."
Zhou Qianxin said: "However, if there is no reply so far, it should be a mention of DNA samples." ” "That's it, Cheng, I know."
Yu Chen still didn't get out of the embarrassment just now, he was anxious to get rid of it, and said, "If the result is out, let us know immediately."
Lao Yuan, let's go, let's go to the reconnaissance. ” Yuan Youchong seemed to be smiling, he naturally saw Yu Chen's embarrassment, and at this moment he was thinking about whether to tease him a few more words, or let this guy go.
But Yu Chen obviously didn't want to give him this opportunity, and left the forensic office as if he were running away.
"Hey, it's good for Team Yu."
Xiao Hua just came in from outside, saw Yu Chen hurriedly went out, and hurriedly said hello, but seeing that he didn't care about himself, he couldn't help but feel a little strange, and watched Yuan You rush out again, and after saying hello again, he asked, "Team Yuan, what's wrong with Team Yu?"
"It's nothing, busy with your own."
Yuan Youchong patted him on the shoulder and chased him out.
Soon came to the office of the Graphic Investigation Bureau, handed over the mobile phone to Si Junnong, and asked him to step up the locking of the suspect vehicle through surveillance, and then asked: "By the way, during this time, have you found anything here?"
"Well, in fact, we have already determined the license plate of this van," Si Junnong said: "Previously, because there were too many vehicles entering and exiting, there was no result from the surveillance video investigation at the access control, but after receiving the notice from the Yuan team, we called up the surveillance near the crime scene again." ” "Come and see," he said, turning to the computer, opening a file, and continuing, "I won't show you the video, just look at the screenshots."
Look, this is the face of the van, and from this angle, you can see the license plate and the appearance of the suspect. ” "It's a pity that we checked and found that this license plate is bound to a Chevrolet, and the suspect is obviously a fake license plate again.
In addition, the performance of the camera is not good, there is too much noise, and the appearance of the suspect can only see a general outline, and the specific features are not clear. ” "It's all the result of asking colleagues from the technical team to help deal with it, but it's already the limit of being like this."
Then, he switched to the next picture and said: "As for this, it is a video taken when the van left, and you can see that the suspect has been replaced, but unfortunately, the facial features are still not clear." ” "However, we are currently tracking the van, and our colleagues at the Traffic Management Bureau have expressed their full cooperation.
I think that with the help of those high-definition probes on the road, we should be able to capture some valuable and clear photos. ” "As for the brown speedpie from earlier, I'm sorry, we lost it, but the traffic management bureau is still trying."
"Okay."
Yuan Youchong encouraged: "It's already very good, go on, notify us if you find it."
There is a video on this mobile phone, and you can also pull a piece of the technical team to see if you can process it and intercept some valuable clues. ” "Okay, leave it to us."
Back in his office, Yuan Youchong hurriedly sat down, raised his feet and rubbed them, and said, "Alas, it's really not good, I used to feel nothing when I stood all day, but now, for most of the day, it's so sore that my bones are almost good, but my muscles are still a little affected." ” "Exercise in moderation."
Yu Chen lit a cigarette and leaned his butt on the desk, not knowing what he was thinking.
Seeing this, Yuan Youchong was a little curious and asked, "What's wrong with you?"
"Still that question."
Yu Chen said: "You think, Zhou Xingtai was threatened with death, so it was too late for him to hide from the suspect, how could he chase the suspect in turn
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