Chapter 133

"I'm tired, let's smoke a cigarette." Wu Jun had been digging in the courtyard for a while and felt his waist and back aching, so he stood up without hesitation and went out to light a cigarette.

The cigarette he was smoking this time was his own Liqun, which was strong; half a cigarette at a time was enough to numb himself.

Jiang Yuan came out to keep him company for a cigarette and said: "Why don't you rest outside for a while? We can just manage inside."

"Okay." Wu Jun agreed unexpectedly.

Jiang Yuan was slightly surprised. In his impression, Comrade Wu Jun was still relatively hardworking and generally unwilling to be lazy. Was this because he saw the scavenger's miserable state and suddenly had a re-interrogation of life?

Wu Jun saw Jiang Yuan's expression, laughed, and said: "Anyway, I'm just a filler coming here this time, why work so hard?"

"That's not true, you have such seniority." Jiang Yuan said insincerely to comfort Old Wu.

Wu Jun took a puff of his cigarette and laughed: "Counting you, there are already three forensic doctors. Do you really need to call me here to cut DNA?"

Jiang Yuan didn't have the heart to say more. Indeed, for the scene in front of them, although there was a lot of work, there was really no need to call two forensic doctors over.

DNA samples can be collected by scene investigators. If the local ones aren't good enough, they can apply for transfers from the municipal bureau. For cases at the level of homicide, they usually get as much support as possible.

Of course, for now, Jiang Yuan and Wu Jun were actually this "as much as possible."

Jiang Yuan's fingerprint technology was likely what was valued. As the champion of the provincial fingerprint battle, and having solved 10 cold homicide cases in one go, one can imagine that in the days to come, people would constantly be inviting Jiang Yuan.

Longli County was just too familiar with Ningtai County, so familiar that they knew the relationship between Jiang Yuan and Wu Jun, and they were embarrassed to invite Jiang Yuan without inviting Wu Jun...

Comrade Wu Jun's role naturally existed; anyway, having one more forensic doctor and one more pair of hands was always good.

But as for the initial request, it was still to ask Jiang Yuan to handle fingerprints and scene investigation.

Wu Jun was implicated.

Wu Jun also saw this clearly and had no intention of proving himself.

His skills had long since matured, and from now on, he would only continue to go downhill. Why work so hard running to another county to be basic labor?

"Immortal Wood Romance"

"I'm going to order some pork intestine and pig stomach chicken soup to eat. If you have time, come over and eat together. The county will probably treat us to a simple meal, at most a buffet." After Wu Jun finished his cigarette, he put the butt away himself and walked toward the shop at a leisurely pace.

Jiang Yuan quickly took a step to follow and said: "I'll try my best to come over. Can we walk there?"

"Looking at the navigation, it's only a few hundred steps away. If we drive, we'd have to park in a parking lot, so let's just take it as a walk." Wu Jun waved his hand, greeted the people from Longli County, and swayed away on his own.

It was already off-duty time, and although police officers don't have overtime, the people in Longli County still didn't find it easy to manage the forensic doctors from Ningtai County.

In the time it took to be dazed, Wu Jun was already at the end of the alley, like a young lady relieving her worries.

Jiang Yuan returned to the courtyard to continue working.

The blood-stained items had all been wiped, and the items judged to have potentially come into contact with the killer had also been sampled. Next, Jiang Yuan's task was to extract fingerprints.

Extracting fingerprints and extracting DNA are sometimes in conflict. For example, so-called latent sweat fingerprints are fingerprints formed by sweat; unlike blood fingerprints, which can be seen at a glance, they need to be viewed with a UV lamp or similar before they can be found.

But on the other hand, sweat can also be used to extract DNA, which is a technology that has only existed in the last ten years or so.

If you wipe the sweat away to extract DNA, won't the fingerprint be lost?

Although it is said that there are some methods to extract latent sweat fingerprints without damage, in general, the difficulty is higher. For example, the technicians in Longli County themselves basically had no ideas in this regard.

It's not that they don't understand the relevant technology at all, but hearing about it and doing it, and doing it and mastering it, are worlds apart. Especially for this kind of homicide, it is definitely not a place for technicians to practice.

Therefore, technicians who haven't practiced the technique usually won't try it at a homicide scene.

The technicians on-site handling fingerprints were basically relying on the rhythm of dusting powder the whole time.

Or looking at it from another angle, if they were willing to try various things daily, willing to participate in various trainings, and actively improve themselves... then their ability would be different.

In Longli County, it wasn't Jiang Yuan's turn to provide guidance.

He just did the fingerprints himself, and after the fingerprints were done and photographed, he would do the DNA.

In this way, the speed was even slower. Seeing that it was getting dark and the bright floodlights were turned on, Jiang Yuan's work became even harder. UV lamps and the like would be interfered with, and it was not easy to photograph the ridges and lines of the fingerprints clearly.

Jiang Yuan stretched and fell into deep thought.

Looking at this mess!

Never mind 72 hours, this is work that couldn't be finished in seven days.

To talk about how many items are in a scavenger's courtyard, one can refer to news related to hoarding.

For example, a certain old man hoarded a large number of express delivery items in a two-bedroom apartment. After the surrounding neighbors couldn't stand it anymore, the property management helped clean it up, and it took more than a dozen people two days to clear it out of the room.

What should be noted here is that the dozen people clearing it out of the room only moved the things out.

If these dozen people were converted into technicians, and they were asked to scan for fingerprints, wipe for DNA, and take samples for every piece of item, and not just in one place, think about how much time that would take.

After Jiang Yuan had been busy for a day and a night, he finally realized:

The criminal investigation team responsible for on-site evidence collection here in Longli County is a bit silly.

Regardless of whether they like silly methods or are truly silly, Jiang Yuan couldn't hold on anymore.

Only then did he remember his master who went to eat pork intestine and pig stomach chicken soup, and he quickly made a call.

"Yeah, the taste is quite good. If you want to eat, go there yourself; they make it as a late-night snack. I'm going to sleep for a while and will go over to help tomorrow morning." Wu Jun mumbled a few words and hung up the phone.

Only then did Jiang Yuan notice that it was already early morning.

He hadn't even worked this hard in Ningtai County.

However, thinking about it, it was very reasonable; he was not from Longli County, so naturally, they would use him hard and squeeze him dry before saying anything.

"Are you guys not going to rest?" Jiang Yuan looked at the other technicians around him.

The technicians on-site were all older than him, and they all looked at Jiang Yuan with the expression of looking at a silly child, and someone said: "We have already changed shifts."

"Uh... that's true." Jiang Yuan felt that he had been called, but it seemed he hadn't been called...

So, comprehensively speaking... he was quite silly.

"Take a break, let's eat a late-night snack together in a while." Everyone on-site was an ordinary technician. Those with leadership positions and authority had long gone home to be scolded by their wives. Only technicians without power or position could stay at the scene with peace of mind, not even having the qualification to be scolded by their wives.

This also proves another point: the grassroots composition of ordinary county bureaus is made up of monk temples.

Although female police officers join one or more monk temples every year, considering that there are homicides every year and economic cases assigned by superiors, when they work until their hair falls out, female police officers will also be scared into a panic.

Jiang Yuan really couldn't work anymore.

He retreated from the courtyard, took off his mask and gloves, and sat opposite the small courtyard, looking at the courtyard in a daze.

When people are too tired, they become like this; they don't even want to move their brains.

Jiang Yuan was the same; he didn't want to think about why a scavenger would be beaten to death—

Conflicts arising from scavenging? Then why did it happen in his home? Moreover, no property was lost, and there were no signs of even being rummaged through in the rooms inside.

It is more likely that the killer was targeting the person.

But still, is a little scavenger old man worth a murder? Why go to such lengths?

This is the most difficult part of this case, and it is also why Longli County hurriedly called for reinforcements. Because unless technical means are used to point directly at the killer, ordinary case-solving strategies don't work.

Common analysis of interests? There are no interests; crime of opportunity for money? There is no property; crime of opportunity for lust? There is no lust either.

Jiang Yuan looked at the courtyard gate, recalling the bloodstains he had seen before, and subconsciously began to analyze.

The killer likely followed the scavenger into the courtyard, but after entering, he kicked him over. This is because the initial bloodstains were mainly splashed on the ground, which was an attack motion from top to bottom.

And afterward, the scavenger did not resist further, but only fled, and in the process of fleeing, he knocked over many things. These things covered the ground, forming the second wave of beating...

Next, was the third wave.

Jiang Yuan patted his forehead. The continuous beating was, to a large extent, revenge and venting. Who had the scavenger offended?

Jiang Yuan picked up his phone and put it down again.

Such an obvious criminal investigation route, the criminal investigation personnel in Longli County couldn't have failed to think of it. Although from the perspective of criminal science, they were quite clumsy, but outside of technology, they couldn't have failed to think of such basic content.

Jiang Yuan then extended his thoughts to the field he mastered and excelled in...

In a continuous beating and venting, it can be assumed that the killer would leave a large amount of traces.

During intense exercise, sweat will drip, hair will fall, dandruff will fly, and if the beating is satisfying, he might even have a runny nose, sneeze, and if it is revenge, he might even cry bitterly and roar twice, "I have taken revenge"?

But where are the traces?

Or rather, with so many traces at the scene, how to prove which trace is the killer's, and not brought by the scavenged items?

The murder weapon and bloodstains!

These two things absolutely cannot be brought by scavenged items.

Now, the murder weapon hasn't been found, so the first choice is bloodstains.

Most of the bloodstains on the items were sampled, and some of them were done by Jiang Yuan.

As for those outside the items, the bloodstains on the walls and ground did not fall within Jiang Yuan's previous scope of work.

The problem returned to the scene Jiang Yuan saw when he first arrived and entered. He was looking at the cast-off bloodstains on the wall at that time, and Wu Wu Fa Yi Wang Lan from Qinghe City said at the time, "The bloodstains have been sampled."

Jiang Yuan recalled the scene at that time. The exhaustion of a day and a night first surged into his heart, and a thought couldn't help but rise in his mind: given the level of the technicians in Longli County, whether they sampled these bloodstains or not, what does it matter!

It's better to do it again yourself.

It's more cost-effective than wiping all the items in the scavenger's courtyard!