Coroner Coroner

"Then, this drop of blood is..."

He thought carefully for a while before giving the answer with a bright eye:

"Is it the blood sucked by mosquitoes from Yoshiichi Aramaki?"

Mosquitoes don't just sit around after sucking blood and then spit it back onto their victims.

So this means...

"While that mosquito was sucking blood, was it killed by Arakawa Yoshiichi?"

"That's right!" Lin Xinyi secretly gave him a look of admiration.

Then he asked again: "What else? What else do you think of?"

"This..." Henggou Sanwu struggled for a while:

With his [-]-[-] reasoning ability with Uncle Maori, it is already difficult enough to see the second layer.

There is really nothing more to see.

"Actually, you're very close to the answer."

Lin Xinyi unhurriedly revealed the answer:

"This mosquito is the proof."

"If the mosquito was killed by Yoshiichi Aramaki while sucking blood, then the drop of blood on Yoshiichi Aramaki's wrist will also contain the mosquito's own body fluids."

"As long as we can find the mosquito's body in the murderer's car, we can compare the DNA of the mosquito in the car with the DNA in the blood on the deceased's wrist to prove that the deceased has been in the murderer's car!"

The answer he gave was somewhat unexpected.

Henggou Sanwu followed Lin Xinyi's train of thought and thought carefully for a moment, but in the end he just frowned and asked:

"No, Mr. Lin."

"All we know now is that Yoshiichi Huangaki killed a mosquito during his lifetime."

"Who knows whether he was bitten by mosquitoes in the car, or before getting in the car, or after getting off the car, at the beach or in the hotel parking lot?"

Henggou Shenwu was a little puzzled, how could Lin Xinyi be sure that the deceased encountered the mosquito in the murderer's car.

"I certainly don't 'sure.'"

"It's just a guess, a bold guess."

Lin Xinyi corrected the words very rigorously, and then explained:

"How well the body responds to a mosquito bite actually depends on how well the immune system adapts to the mosquito toxin."

"Being bitten by the same type of mosquito for the first time, the immune system does not recognize the toxin, so it will not respond at all."

"And being bitten by the same type of mosquito a lot, the immune system assumes that this toxin will not harm the human body, so it will only react slightly, so that there are no pimples on the body, only some inconspicuous little red spots appear."

"And like the deceased, the reaction of a big red bump on the wrist..."

"It's in the initial adaptation phase of the immune system to this type of toxin."

"At this point the immune system has already been exposed to this mosquito toxin, can recognize it, and respond violently."

"So after being bitten by a mosquito, the human body will immediately swell, accompanied by surrounding redness, and it will reach its peak within 20 minutes."

"After 20 minutes, the bump will itch, harden, shrink in size, and then slowly subside."

Lin Xinyi first gave a little science introduction.

And the real use of this knowledge is:

He can vaguely infer the time when the deceased was bitten by mosquitoes by observing the shape of the swollen bag of the deceased.

Just like the present-day Aramagaki City...

The lump on his wrist was badly swollen, and there was still a lot of redness around it.

From this look, it can be seen that Huangjuan Yiichi was bitten by the mosquito within 20 minutes before his death.

And driving from the beach, it will take more than 20 minutes on the road alone.

Therefore, Aragaki Yoshiichi was definitely not bitten by mosquitoes at the beach before getting in the car.

So... Could it have been bitten in the parking lot after getting out of the car?

"Probably not."

"At that time, Arakawa Yoshihiro had already been hijacked to the parking lot."

"The next step for the murderer is to kill Aragaki Yoshiichi and stuff it into my car."

"Do you think the murderer will let him get out of the car by himself... no... should I say, let him get out of the car alive?"

Although there are not many people in this parking lot, it is a public place after all.

And there are cars everywhere, pillars, things that can be used as hideouts and bunkers.

Lin Xinyi substitutes himself into the role of the murderer.

He felt that he would kill Huangjuanyishi secretly in the car, so that the other party would not run away after getting out of the car.

"Also, Henggou, have you noticed—"

"Where is this swelling located?"

"Location?" Henggou Sanwu carefully looked at the corpse's wrist: "Isn't it just on the wrist?"

"No, be more specific."

Lin Xinyi smiled slightly and explained:

"We only saw this swollen bag after opening the cuffs of the deceased during the autopsy."

"That is to say, the location where the mosquito bite formed a swollen bag is within the coverage of the cuff of Yoshiichi Aragaki."

"What do you mean?" Henggou Sanwu still didn't understand.

"Mosquitoes are not good at picking people's clothes."

"They typically only bite on exposed human skin that isn't covered by clothing."

As he spoke, Lin Xinyi turned his attention to the corpse lying flat on the ground again:

Yoshiichi Aramaki was wearing a long-sleeved T-shirt today.

Because he is so big, even this large long-sleeved T-shirt is as tight as a tights.

The cuff was always tightly attached to his wrist.

With the strength of that little mosquito alone, it is certain that it will not be able to get in.

But on the corpse's wrist, the swollen lump formed by mosquito bites happened to be inside the covered part with the cuffs.

"What does this mean?"

Henggou Shenwu asked hesitantly:

"The deceased ever rolled up his cuffs?"

"That possibility cannot be completely ruled out."

"But I also thought of another possibility:"

Lin Xinyi paused for a moment, and then instructed Henggou Shenwu:

"Have you tried lifting the dead man's arm to have a look?"

"Okay..." Henggou did not understand, so he gave it a try:

I saw that as the arm was too high, the sleeves that could have tightly covered the entire wrist were naturally pulled back and slid down, exposing the small half of the wrist.

"As the posture changes, the relative position of the clothing and the body will naturally change."

"As long as the arm is raised, the sleeve will be pulled back, exposing the wrist that would otherwise be covered by the sleeve."

"This..." Henggou Sanwu was still puzzled: "Isn't this possibility too small?"

"It takes a certain amount of time for mosquitoes to land on the body and look for opportunities to bite."

"Who would raise their arms so their wrists stick out of their cuffs and keep them so long?"

"Of course someone will."

Lin Xinyi smiled and replied:

"When you drive, don't you put your hands on the steering wheel?"

Henggou Shenwu hesitated for a while, then suddenly reacted:

"I see!"

"When a person is driving, put his hands on the steering wheel, and the cuffs will naturally slide back."

"So Mr. Lin, you guess..."

"I guess after the murderer hijacked Aramaki Yoshiichi at the seaside, in order to keep an eye on his prey, he sat in the back seat and threatened him with a weapon, and asked Aramaki Yoshiichi to drive."

"And it was at this time that he let his wrist out of the sleeve and was bitten by the mosquito on the car."

"If that's the case..."

Lin Xinyi's voice also quietly added a bit of anticipation:

"Then we are very likely to find the mosquito that was killed by Huangjuan Yishi in the murderer's car!"

At that time, whether it is comparing the DNA of the mosquito or the DNA of the human blood in the mosquito, it can prove that Yoshiichi Aramaki once boarded that car.

It can also be proved that Yoshiichi Aramaki was on the car within 20 minutes before his death, shortly after the swelling was formed.

This can explain many problems.

"Mr. Lin, you are really amazing!"

It was the first time for Henggou Shenwu to be fully exposed to such a novel way of solving crimes, and he couldn't help feeling excited.

"but…"

When he was excited, he suddenly remembered:

"Can mosquito DNA also be used for comparison?"