civil forensic

Chapter 1339 Fingerprints Distinguish Between Men and Women

Since we're already here, and the high-definition spectral imager has already been delivered, it's only right to collect more fingerprints.

Whether you herd one sheep or ten sheep, it's all the same; it's like saying that whether you send one criminal to prison or ten criminals to prison, it's all the same.

The person is dead; it means that if a victim dies, the murderer should not live either.

Liu Zhuangshi organized a team of people, each carrying two boxes of evidence, and brought them to the conference room, posing them as if they were open to anyone to choose from.

Huang Qiangmin, with his men, acted as a familiar intermediary and said, "Chief Liu, it's almost time to leave work. Why don't you pick a few important cases first, and we'll see if there are any suitable ones? We'll also see if we can make a breakthrough on Jiang Yuan's case."

Liu Zhuangshi smiled first, not out of politeness, but because he was holding back the words "What's the point of eating now?" that were about to slip out.

Unfortunately, Jiang Yuan isn't his. If Jiang Yuan were his man, he would definitely—of course, he'd have to be careful with his spending—but if Jiang Yuan were his man, and now there's a chance to solve a murder case, what does eating matter? Eating in shit and paying for the tests himself isn't even an exaggeration.

In order to use Jiang Yuan for as long as possible, Liu Zhuangshi, like a scumbag, said in a nonchalant yet provocative tone, "Why don't we go home first and let Director Jiang get some rest? He'll be more efficient at work when he's well-rested."

"That's not necessary." Huang Qiangmin answered for Jiang Yuan without even asking him. "You just sent out a large team, and there are still several other teams on standby. If we make a breakthrough on a case, you can send people out immediately. By tomorrow morning, we should have a preliminary conclusion, which will make it easier to move forward, right?"

Liu Zhuangshi's smile almost faltered. It turned out Jiang Yuan was about to leave work, while his team was going to work through the night. So, the "scumbag" he thought he was, in the other person's eyes, was just a pushover?
To manage his emotions, Liu Zhuangshi couldn't help but pat his face, silently telling himself: Hang in there, so be it, as long as the goal is achieved, it's a victory!

Then, Liu Zhuangshi solemnly said, "Political Commissar Huang is right. I was wrong."

"No, no, it's not that serious." Huang Qiangmin was stunned by Liu Zhuangshi's action of slapping himself. He had seen many criminal police captains, but it was rare to see one so emotionally unstable.

Huang Qiangmin quickly grabbed Liu Zhuangshi's hand and said, "You choose a case first, we can talk about other things later. We're not here for just a day or two. Tonight, you should investigate the cases. If there's a breakthrough tomorrow, or even a big breakthrough, that would be great. Then we can move on to the next case. If not, we'll keep thinking about it. You agree, right?"

"Okay, okay... thank you, thank you..." Liu Zhuangshi grabbed Huang Qiangmin's hand in return, and the two acted like close friends who could sleep side by side.

Huang Qiangmin then gently patted Liu Zhuangshi's hand and said, "We also want to thank you. Jiang Yuan was inspired by your case to think of using a high-definition spectral imager to collect the third-level features of fingerprints. The fact that high-definition spectral imagers can be widely used in this area should be beneficial to the entire criminal investigation system..."

“That thing belongs to the provincial department,” Liu Zhuangshi said in a low voice. He knew what Huang Qiangmin meant, but he couldn’t give away something he didn’t own.

“You can use this technology; you can’t keep buying from the provincial department.”

“50.” Liu Zhuangshi’s smile twitched.

"We don't need to buy such a high-end configuration. Of course, one wouldn't be enough for a criminal investigation team as large as yours..."

"Our fiscal allocation this year..."

"The funding is just a number. Some get more, some get less. Why is that? Part of the reason is good performance. Those who don't perform well might not get this year's funding next year. Besides, companies that sell equipment don't necessarily require full payment. Some don't even require a deposit. Just sign a document, and they'll handle everything perfectly..."

"We might not have this many next year either..."

"Who said I have to pay it back next year? Besides, I can pay it back slowly over several years..." Huang Qiangmin looked at Liu Zhuangshi as if he were a newborn sycophant, who actually thought he could get things done with his limited funds. He didn't know how to make good use of financial tools. Anyone with a little grassroots experience should know that in the emotional aspect of buying a mobile phone on installment, the installment period is longer than the time it takes to buy the phone, which is longer than the emotional aspect.

"But...but..." Liu Zhuangshi muttered to himself. He had no experience in this area and didn't know how to say or do anything.

……

Jiang Yuan ultimately chose an accidental injury case.

The case is quite simple. It was nothing more than a conflict that broke out between the two parties when they were choosing a campsite by the river. One party was injured. One person suffered a fractured knee joint and a torn cruciate ligament, which was assessed as a second-degree serious injury. The other person had a piece of their lip knocked out and six teeth knocked out, which was classified as a first-degree minor injury.

At this point, if the other party chooses to surrender as usual, then the criminal investigation team has nothing to do with it; the local police station, or at most the district-level criminal investigation team, will handle the case.

However, the suspect chose to flee, which turned it into a serious case that could result in a sentence of more than 10 years, requiring investigation by the Criminal Investigation Detachment of Anwan City Public Security Bureau.

However, because the case occurred in the wild, the lack of surveillance footage and the reliance solely on the victim's description led to a stalemate in the investigation.

This case is one of the major cases for the Anwan Municipal Public Security Bureau this year. Regardless of whether Jiang Yuan comes or not, the Anwan Municipal Public Security Bureau will concentrate its efforts on investigating it.

Of course, if Jiang Yuan can resolve this case, the pressure on Anwan City Bureau will be greatly reduced.

Liu Zhuangshi brought the victim's jacket, this time an Adidas hoodie, with a long trail of blood dripping from the collar. However, because the contact occurred before the beating and the bleeding, the blood had obscured any possible fingerprints.

It's not surprising that DNA extracted from blood can't be compared to the original.

The completeness of domestic DNA databases is more than two levels lower than that of fingerprint databases.

However, collecting these fingerprints was not difficult for Jiang Yuan.

Especially with a high-definition spectral imager, Jiang Yuan scanned a piece of clothing and obtained 12 incomplete fingerprints in one go. He then marked the feature points, which are the secondary features of the fingerprints.

As before, if a match is found, someone will be sent to meet the suspect to obtain the third-level fingerprint characteristics, which will further confirm their identity.

The reason for choosing clothing is that the material has a significant impact on fingerprint collection. For example, a primary school child can easily remove fingerprints from a wooden or metal tabletop by being taught the proper techniques, but many novice forensic technicians would struggle to remove fingerprints from a round table leg.

Even experienced forensic technicians may not be able to extract suitable fingerprints from objects like coins.

The difficulty of collecting fingerprints varies depending on the material of the clothing. This time, the jacket was considered one of the more difficult types, which gave Jiang Yuan a chance to collect fingerprints that he hadn't been able to collect before.

A total of 12 fingerprints were found, belonging to 8 different fingers.

Jiang Yuan focused his attention on several fingerprints on the abdomen, where a suspect had reportedly slapped the area.

Ultimately, Jiang Yuan selected two incomplete fingerprints and included them in the scope of this fingerprint competition, allowing fingerprint experts, both smokers and non-smokers, to participate.

Soon, after Jiang Yuan processed the third-level features of the fingerprint, he quickly deleted one of the fingerprints.

Li Zemin watched the whole process, and after Jiang Yuan finished, he asked in a low voice, "Why did you delete one fingerprint?"

“Because it’s a woman’s fingerprint, no women were involved in the fight. In particular, the other side’s female members didn’t touch the victim’s side,” Jiang Yuan replied.

"They're fighting and no one's going to help?" Li Zemin said, then patted his head. "That's not what I meant. How do you know the deleted fingerprint was a woman's? Can you tell a man from a woman's fingerprint?"

“Okay. Let’s look at the number of sweat pores. The average density of sweat pores in women is 13 per square millimeter, while the average density in men is 9 per square millimeter. That means the density of sweat pores in women is 1.5 times that of men. So, we can delete the female fingerprints at the scene first and concentrate our efforts on processing the fingerprints of the other male suspect.” Jiang Yuan explained to Li Zemin while taking fingerprints.

The fingerprint experts who remained in the conference room laughed when they heard Jiang Yuan's explanation and lit cigarettes.