Lin Xinyi said such a conclusion, and then suddenly got up again and searched carefully in the bathroom.

Sure enough, it didn't take much effort for him to find a bucket in the corner of the bathroom.

That's the plastic bucket that the café staff use to clean up.

When I looked closer, there was a small half bucket of bleach that hadn't been emptied at all.

"It seems that the murderer poured bleach into this bucket and then put the deceased's hand in it and soaked it."

Lin Xinyi said this, and looked at the bleach bottle on the ground on the side:

"As for the bleach, it should have been taken from the bathroom by the murderer."

"Bleach was originally a common toilet cleaning product in the bathroom, and the murderer should have seen the bleach placed in the corner of the bathroom during the murder, and then remembered to use it to clean up the traces."

He analyzed it carefully, and his brow furrowed more and more.

And Mao Lilan on the side thought carefully for a while, and then asked a little ignorantly:

"Mr. Lin, I remember you said that bleach seems to be usable..."

"It can be used to destroy DNA."

Lin Xinyi frowned tightly:

"The main ingredient of bleach is calcium hypochlorite, which reacts with water to form hypochlorous acid."

"Hypochlorous acid produces free radicals, and excess free radicals, especially reactive oxygen species, can attack almost all biomolecules, including DNA."

"Specifically, free radicals can destroy the base modifications of DNA molecules, causing DNA single/double strands to break."

"Anyway, if the murderer washed the deceased's hands with bleach and soaked them for more than a certain amount of time..."

He paused slightly, and his tone became more serious:

"Then we probably won't be able to detect enough DNA fragments from the contents of the deceased's fingernails to support the results."

Hearing this, Mao Lilan's expression soon became even more solemn than Lin Xinyi:

Even the DNA has been destroyed, so won't there be no evidence to catch the murderer?

What should I do?

But seeing her nervous and serious look, Lin Xinyi shook his head with a smile instead:

"Don't get too nervous."

"Even if the biological specimen in the nail is destroyed, can't there be any other evidence?"

"When the murderer strangled the deceased, the two bodies were close together."

"In addition to fingernails, it is also very possible to rub hair and dander on clothes."

"And those traces are not visible to the naked eye by the murderer."

Saying that, Lin Xinyi also said meaningfully:

"Not to mention..."

"The murderer has worked so hard to clean up the traces, but there are no three hundred taels of silver here."

"This—" Maolilan reacted quickly.

She remembered the confrontation with Tanaka Tomoshi yesterday, and immediately came to a conclusion:

"This case is also committed by an acquaintance?!"

That's right, a robbery that hits a random collision kills, and very few people will process the traces after the killing.

Especially, in public places such as café restrooms.

After all, the murderer did not know the deceased, and even if DNA was left at the scene, it would be difficult for the police to find him in the vast sea of people.

But acquaintances commit crimes differently: they are often close to the deceased, and in order to prevent the police from investigating them, they are eager to clean the scene cleaner than the dust-free operation room.

But this is often self-defeating.

Because the act of cleaning up the traces is bound to arouse the suspicion of the police, and when the police target the suspicion on a certain person, that guy is not far from a life of clothing, shelter, food and drink.

After all, there are limits to human intelligence.

No matter how careful a person is, there will always be omissions that he can't notice.

"Miss Maori, you're right, this case is mostly committed by acquaintances."

"Next, as long as the social connections of the deceased are investigated, it should not be difficult to lock down the suspect."

Lin Xinyi did not hesitate to praise Mao Lilan, who reacted quickly:

"But..."

"But we, as forensic doctors, can never have preconceived notions."

There is no need for Lin Xin to emphasize it again and again, the good student Mao Lilan has already completed the answer:

"I know, Mr. Lin."

"The current case points to acquaintances committing crimes, but the possibility of robbery and murder and impulse murder cannot be completely ruled out."

"And to rule out the possibility of the latter, we have to take a closer look at the situation on the spot."

As he spoke, Mao Lilan carefully examined the cramped toilet cubicle, and quickly turned his gaze to the window in the wall of the cubicle.

The windows are open, allowing access from the compartment to the outside world.

"When we found the body, it was against the door, blocking the door from the inside."

"So, if the murderer is killing people in this toilet cubicle, then there are only two ways for him to leave the cubicle after killing someone:"

"One, escape directly from the window in this compartment to the outside of the café."

"Two, I climbed out of the gap between the top of the cubicle and the ceiling, and then left the bathroom, and left the inside of the café."

"But this first possibility..."

As he analyzed himself, he leaned over to the narrow window and carefully observed the dust on the edge of the window:

"This first one is probably unlikely."

"The dust that has accumulated on the edge of the window has not even been wiped off, and the murderer certainly did not leave here."

"And this window is very narrow, so it's easy for a girl like me to get stuck when I climb out."

"If you want to somersault through the middle without rubbing against the window frame, I guess only petite children can do it."

As she said this, she quickly raised her head and shifted her gaze to the top of the toilet cubicle:

"The gap between the top of this compartment and the ceiling is relatively large."

"As long as it's a thinner adult, you should be able to get out of here."

"It's just..."

Miss Maori's smooth observation and analysis finally encountered difficulties:

"The deceased was stabbed in the heart, and the bleeding was so heavy."

"And this bathroom space is small, and you can't dodge it."

"When the murderer drew the knife, there should have been a lot of blood on his body."

"And when a blood-stained person walks out of the bathroom, the staff and guests in the café should more or less notice."

She rubbed her chin inadvertently as she pondered, looking a bit like a detective.

However, Lin Xinyi pointed out a direction of investigation:

"Speaking of blood, I've noticed something strange."

"First of all, there was blood on the door frame at the top of the toilet cubicle that shouldn't have been there."

"Secondly, there's the splattered bloodstain in this cell."

He pointed to the cubicle, the bits of blood that were almost evenly splattered on the toilet, walls, and floor:

"It's a complete splattery of bloodstain pattern."

"It's like... When the blood spurted out, there was no obstacle in front of the deceased. ”

"It's weird, isn't it?"

"The space in the compartment is only so large, if the murderer is the person who killed in this compartment, he will definitely block some of the blood spilled by standing in front of the deceased."

"It's very rare for a blood-spurting case like this to be done without any obstruction in a homicide like this."

The knife was stabbed into the heart from the front, and when the murderer drew the knife, he should have stood in front of the wound.

But the bloodstain form at the scene told Lin Xinyi:

When the murderer draws the knife, the person is "not present".

"Not to mention, and this knife..."

Lin Xinyi carefully picked up the knife that was left at the murder scene:

"The splattered blood stains on the handle of the knife are also evenly distributed, as if they are completely unblocked."

"You know, the handle of the knife is where you hold it, when the blood splatters... The hand holding the knife should always hold the blood. ”

As he spoke, he frowned slightly and asked Mao Lilan:

"Miss Maori, what do you think?"

Although Lin Xinyi quickly discovered these unusual traces, he didn't think of the reason for the formation of these strange traces for a while.

After all... The murderers in this world are too bells and whistles.

With Lin Xinyi's overly realistic mind, he really can't restore the real situation at the time of the crime for a while.

But Maoriland is different.

She has been following the great detective Kudo since she was a child, and she is used to seeing all kinds of tricks and murderers, and even her imagination has become wild.

At this moment, being mentioned by Lin Xinyi, Mao Lilan quickly reacted:

"Blood droplets on the door frame of the compartment, splatters of blood that are not blocked in any way..."

"Mr. Lin Xinyi, I understand!"

"The murderer was not the one who killed in the compartment at all, but threw the body into the compartment from the outside."

Maolilan's eyes lit up and she said what she thought:

"The murderer must have strangled the deceased with a rope outside the compartment first."

"After strangulation, he found bleach in the bathroom, so he improvised to soak the deceased's hands with bleach."

He then tied the rope to the hilt of the knife and stabbed the deceased in the heart with the knife.

"Then, the murderer threw the body of the deceased through the gap above the compartment into the compartment and blocked the door, creating a 'secret room'."

"Finally, he pulled the rope from the outside of the compartment, and pulled the knife, which was tied to the rope, from the heart of the deceased."

"Uh..." Lin Xinyi was stunned when he heard it.

After digesting the killer's bells and whistles a little, he understood the murderer's intentions:

"I see... If the knife is drawn in this way, the murderer will not have blood on his body. ”

"He can walk out of the bathroom and blend in with the crowd without being noticed."

"But..."Lin Xinyi still didn't understand a little: "Isn't this an extra move?" ”

"Since they've strangled... Why don't you just use the strangulation to get rid of people, why bother to make up for it? ”

"If it's just strangulation, don't you have to think about getting blood?"

"Hmm... Oh yes. Mao Lilan was slightly stunned.

She worked hard to use her imagination to think about the strange murderers she had seen around Kudo before...

"Could it be—" said Maolilan tentatively:

"Does the murderer want to use this kind of trickery to eliminate his own suspicion?"

"Mr. Lin, look... The gap in the toilet cubicle is so big that only a thinner person can climb through it. ”

"If we follow the idea of the murderer's design, mistakenly think that he is the person who stood in the compartment and kills, and then turns out of the compartment."

"Then our attention will only be on those who are thin and weak, and we will not pay attention to those who are fit."

As he spoke, Mao Lilan's voice gradually became confident:

"But it's clear that he's smart and he's been mistaken by cleverness."

"After we saw through his ruse, he revealed more clues about himself—"

"Obviously, the murderer was an acquaintance of the deceased, or a sturdy guy."