<h4>Chapter 1418: Chapter 1342: Cross-Reference</h4>


    Blood fingerprints are almost the favorite type of fingerprint for forensic scientists.


    Compared to ordinarytent fingerprints, blood fingerprints are like the suspect actively applied y, almost disying the finest lines of the fingerprint, even more beautifully than y.


    But after wiping, it’s a different story.


    If fingerprints are wiped while the fresh blood has not dried, the lines are soaked with blood, eliminating the basis for fingerprintparison.


    However, after carefully checking the photos from the "Cuiling 211" crime scene, Jiang Yuan was sure that after wiping their hands on the curtain and towel, the murderer left some fingerprint fragments on the edges.


    That is, when the fingers were almost dry but not quitepletely wiped, some residual fingerprints were left behind.


    Through a simple crime scene reconstruction, it is evident that the murderer wiped their hands with the curtain after killing two people and preparing to go upstairs.


    Due to excessive force, the murderer stabbed the victims Zhang Guoyi and his wife over a dozen times, causing the gloves to be soaked with blood, forcing the gloves off and re-cleaning their hands, taking a towel to bind the knife—this sequence was confirmed based on the state of dripping blood at the scene.


    Using conventional fingerprint identification methods, whether from the fingerprints collected from the curtain or the towel, they are basically useless.


    The fragments are too severe, possibly not even marking three to five characteristic points, and fingerprintparison software would yield a massive number of candidate matches.


    Using a high-definition spectrometer improves things; several fingerprints at the edge of the curtain captured more than 4 characteristic points. The quality of fingerprints on the towel was much worse, only yielding about 3, at best 4 characteristic points.


    Jiang Yuan thus focused on the curtain.


    Following the principle of 7 can be used, 8 is hopeful, the distance between 4 or 5 characteristic points is still a bit far. This is when image enhancement technology is needed to increase one or two characteristic points on the basis of 5.


    This process proceeds quickly, making the two fingerprint experts, Liu Changhe and Lin An, quickly feel dizzy.


    Image enhancement itself is a highly counterintuitive operation, with even the basic grayscale determined numerically, and non-professionals watching Jiang Yuan’s process might find it confusing.


    Combined, Liu Changhe and Lin An have an LV0.5 in image analysis, but watching Jiang Yuan’s operations, they felt both dazed and excited.


    They wanted just this kind of Jiang Yuan!


    If it were ordinary fingerprint experts, there would be no need to involve Anwan; the two of them could handle it themselves.


    Jiang Yuan busied himself at theputer for a while, then got up to pull the curtain for image collection.


    Liu Changhe and Lin An hurriedly stepped up to help pull the fabric.


    Amid their busy work, Liu Zhuangshi, head of the Criminal Police Brigade, walked in.


    "Ah, are you retaking fingerprints?" Liu Zhuangshi was relieved somewhat seeing their hard-working state.


    Although his situation was quite bleak, reliant on borrowed resources that were difficult toe by, they weren’t being wasted, as a talent like Jiang Yuan was utilizing them. Thinking so, he felt particrly reassured.


    "There’s a promising fingerprint here," Jiang Yuan exined briefly to Liu Zhuangshi. There wasn’t any need for a long exnation.


    Liu Zhuangshi nodded repeatedly, saying, "Great, there’s a high chance the Cuiling 211 case is a habitual crime spree, and if we find a fingerprint, the matching probability should be high."


    He was speaking optimistically. For Jiang Yuan and others, the most concerning aspect of the case was whether the suspect’s fingerprint was in the database.


    But just as Liu Zhuangshi analyzed, since the Cuiling 211 case’s culprit wasn’t seeking revenge, the probability of it being a habitual crime spree is very high. This is because the murderer was bold yet cautious in the killings, finished off the upstairs couple, wiped hands, re-wrapped hands and knife with a towel, then painstakingly went upstairs to kill a child and a grandmother... It’s hard to master such a process without a stint in prison training.


    Jiang Yuan just nodded slightly, saying, "It’s not certain now if we can sketch out the characteristic points, if we can sketch 7, that would be excellent..."


    "Like the previous cases, you list a suspect list, and I’ll have someone redo their fingerprints," Liu Zhuangshi began relying on a familiar path.


    Jiang Yuan let out a "Hmm," saying, "I n to first use footprints to filter. This way, even if only six characteristic points are marked, a usable list can still be made."


    Not only Liu Zhuangshi, but Liu Changhe and Lin An also looked over, saying, "Footprint can be matched too?"


    "This case is littered with bloody footprints, not using footprints would be a pity," Jiang Yuan said while marking the fingerprint again.


    Liu Zhuangshi pursued further, asking, "To what extent can the footprints be determined?"


    Jiang Yuan, without lifting his head, said, "From the time of the crime, the suspect should be about a 23-year-old male, around 1.75 meters in height, weighing 150 pounds. Shoe size 42, wearing slightlyrger shoes, out-toe gait."


    "This is good, this is good..." Liu Zhuangshi nodded repeatedly, visibly rxing, even briefly feeling that this case was not so serious.


    Of course, this thoughtsted only a moment. The Cuiling 211 case became a significant case because several investigations had failed to break through; merely looking at old photos and evidences and dering the case solved was beyond Liu Zhuangshi’s bravery.


    The members of Jiang Yuan’s Cold Case Squad were exceptionally positive in attitude and upon hearing of progress, eagerly volunteered in their small group chat:


    [Is it time for rotations, let’s let others who haven’t been there go, so they don’t have to work too hard.]


    [Proactively applying for business trips to remote and economically disadvantaged areas.]


    [You are thinking too well, it’s in remote and economically disadvantaged areas that one is most likely to seed!]


    During these light-hearted conversations, Wang Chuanxing initiated a lottery, initially sorting 8 people; if more teams are formedter, there will be another draw.


    Amid the friendly atmosphere, Jiang Yuanpleted the final marking of characteristic points.


    With 6 characteristic points, theputer ran the database, and at least tens of thousands of fingerprints matched the conditions; normally, filtering would be meaningless because behind these tens of thousands of fingerprints are more slightly lower simrity secondary fingerprints.


    But upon intersecting the footprint identification results, the matching fingerprints instantly reduced to a few dozen.


    This number, though not small, is manageable.


    Liu Changhe and Lin An exchanged nces, their eyes slightly excited; for Jiang Yuan, it’s an ordinary case, but for the Anwan City Bureau, it’s significant, and for them, it may represent a career breakthrough.


    "48 groups, if each group is still 4 people, I need to apply for some backup," Liu Zhuangshi said, feeling at ease; assigning 200 people for such a big case was no trouble.


    Of course, the detailed calction is quite horrifying; a daily subsidy for 200 people is 36,000, and a casual trip of three to five days costs about 200,000. Travel expenses alone, whether using police resources, could easily cost 2 million even when frugal.


    At this crucial moment, Liu Changhe, being an insider, immediately offered, "If there’s a budget issue, I can help to apply for subsidies from the ministry..."


    Lin An also stated, "Any inspection project can be sent directly to ourboratory, and they’ll use the lowest fees, which should save a bit."


    Li Zemin, experienced in the field, also knew how to save money, suggesting, "You could consider tagging these 48 people first, prohibit them from leaving the country, and look at their case history. If theye in two batches, it could significantly reduce manpower and travel expenses; within a province or city, there might be several suspects already. They don’t know we are investigating Cuiling 211, so the timing might not matter."


    Jiang Yuan cleared his throat, offered a cigarette to Li Zemin, and looked at Liu Zhuangshi, asking, "What do you think?"


    Ultimately, it’s the Anwan City Bureau handling the case; they are independent authorities and shouldn’t be pushed excessively.


    At this moment, Liu Zhuangshi decided firmly, "Doing it all at once is the safest; we’ve finally got an opportunity... Regarding personnel, we can detail some young people; as for money... I’ll talk to the director!"<fn153c> Discover more novels at fin?novel</fn153c>