The real-life murder cases are different from what's shown in TV dramas.

Crime scenes are often much bloodier, bloody enough to make an average person vomit at first glance, or even faint upon seeing a pool of blood.

Moreover, unlike dramas where the culprit is cunning and plans the murder for three or even ten years, in reality, premeditated murders are rare; most are crimes of passion.

In reality, it's often a moment of conflict leading to violence.

Thus, after many murder incidents, the perpetrator can be identified almost immediately.

After that, it's about making arrests, or sometimes the suspect might turn themselves in.

The case in the Water District is a typical example of a passionate murder.

The crime scene was at the victim's home, where a conflict broke out between the murderer and the victim.

"The husband and wife had an argument, and in a moment of desperation, the husband grabbed a kitchen knife and chased her from the living room to the bedroom, hacking away all the while,"

explained Wang Yishan, the leader of the Water District Criminal Investigation Team, to Liu Guodong and Lu Chuan.

"Have the collected physical evidence already been sent out?"

Generally, Liu Guodong doesn't particularly like taking up secondary crime scene investigations.

After all, no one really knows how well the previous investigation was conducted.

For instance, how well the DNA material was collected, the clarity of the fingerprints lifted, and any traces left by the initial investigation team.

But since the Water District Criminal Investigation Team requested assistance from the higher authorities, it was difficult to refuse, and the person responsible for the investigation here was an old acquaintance of Liu Guodong's, which is why he brought Lu Chuan along to take a look.

"The evidence was sent off overnight. Old Xu intended to analyze the evidence overnight, but unexpectedly his pancreatitis flared up…"

Although Liu Guodong never had pancreatitis, he knew the condition was quite painful and, if not treated promptly, could be life-threatening.

"Given this situation, since the suspect has already been captured and Old Xu has conducted the initial examination, let's go through the scene one more time to see if there's anything missed. If not, the main task is still on analyzing the evidence collected by Old Xu."

Liu Guodong scanned the area, discussing with Wang Yishan.

"Old Liu, you're the expert in this field. You and Teacher Lu go ahead, while I head back to the team to oversee the interrogation."

Wang Yishan and Liu Guodong have known each other for over a decade, which is also one of the reasons Liu Guodong came to aid the Water District Criminal Investigation Team.

Otherwise, Liu Guodong could have refused and let them ask another investigation team for help.

The Criminal Investigation Team is a higher authority, so refusal is an option.

While the two were chatting, Lu Chuan had already started working.

The crime scene wasn't complicated, just that the victim had been cut down by her husband, resulting in excessive blood loss in the bedroom, soaking the entire bed with blood.

Many items in the living room were scattered on the floor, leaving the scene in some disarray.

After committing the murder, the perpetrator voluntarily turned himself in, and the initial interrogation results were sorted out last night.

Wang Yishan had just roughly explained the murder process.

As for the cause, it was simple, marital conflict over trivial matters from a decade or two ago.

"Cross-referencing the evidence list, if there are no major issues, we can leave."

Liu Guodong had already obtained the evidence list compiled by Old Xu last night.

By walking through the scene once more, if nothing particular is discovered, they can return to analyze the evidence.

There's actually not much trouble, primarily testing the murder weapon.

For instance, fingerprints, bloodstains, and the compatibility between the weapon and the victim's wounds, and once confirmed with no issues, the evidence can be secured.

Lu Chuan took the list and started checking item by item from the entrance.

The Water District's investigator Old Xu is quite professional; Lu Chuan has seen him twice, in his forties, previously worked as a frontline detective, and switched to specializing in crime scene investigation over ten years ago.

He hadn't undergone systemic training but had developed his own methods.

Moreover, judging by the markings on the scene, Old Xu's investigation was very meticulous.

Starting from the entrance, progressing step by step inward.

Lu Chuan is currently retracing Old Xu's steps to ensure there's nothing overlooked, completing the secondary examination.

Most crime scenes are usually examined more than once.

Especially for major or important cases, homicide cases particularly so.

However, not just anyone can casually enter the crime scene; single detectives are not allowed.

Any detective, whether a case-solving detective or a technical crime scene investigator, needs to follow approval procedures to enter the scene.

The struggle at the scene seemed fairly intense.

There are splattered bloodstains on the walls, floor, and furniture.

Starting from the entrance door, the bloodstains are intermittent…

Hmm?

Lu Chuan suddenly paused.

He turned back, looking at the bloodstains on the frame of the entrance door.

The blood was projected in a parabolic arc, splattering towards the inside from the doorway.

With intermediate-level Bloodstain Pattern Analysis, Lu Chuan could even simulate the blood projection trajectory in his mind, the angle at which the culprit wielded the weapon, and even the approximate force used.

Bloodstain analysis is one of the most common pieces of evidence in most homicide crime scenes.

In the country, most murder cases are caused by cold weapons.

Commonly used are kitchen knives, sticks, axes, bottles, etc.

There's also manual killing, mostly causing death by asphyxiation.

But regardless of the method, most would leave bloodstains at the crime scene.

Kills with knives, guns, clubs, or axes are bound to draw blood.

Manual killings, unless the victim has no means to resist, like being tied up or drugged.

Otherwise, the victim would certainly resist.

As the saying goes, "A cornered rabbit will bite," so even the meekest victim might scratch the perpetrator's hand when faced with a life-threatening situation, no?

Some murder cases extract the perpetrator's skin tissue from under the victim's fingernails, illustrating this point.

Of course, some perpetrators might wear gloves before strangling their victim or deliberately wear long sleeves to hide their arms, something only very experienced or premeditated killers might think of.

As for the current scene, it's an excellent case for bloodstain pattern analysis.

Drip stains, flow patterns, projected stains, spatter, and the blood pool on the bed – it's all there.

Lu Chuan is puzzled by the bloodstains on the wall edge and doorframe at the entrance.

This is a projected stain, and from the changing thickness of the parabolic arc, we can deduce that the blood sprayed out from the direction of the entrance door, then adhered to the wall and the junction of the entrance door.

From the changes in the serrated edges and extension direction of the bloodstains, the standing positions of the perpetrator and the victim and the direction of the swing can be deduced.

Additionally, on the ground in front of this bloodstain, there's an elliptical drip stain.

From the form and size of the drip stain, the height of the blood source's drop can be measured.

The combination of the projected and the drip stains led Lu Chuan to some doubts.

And this doubt is that the dynamics depicted by the bloodstains and what Wang Yishan just said...

Don't match!

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