Coroner Coroner

"Locar's law of matter exchange tells us that there will be a transfer of matter when there is contact between objects."

"The transfer is mutual."

"It's possible for your DNA to stay on site."

"The things at the scene may also be carried by you."

"For example... cocklebur."

Cocklebur is full of thorns.

The way of reproduction of cocklebur is to use the thorns on the seeds to let passing animals touch them and take them to other places.

So, Lin Xinyi tried to brush the long hair of the long-haired man:

"Look—"

From the messy pile of hair, he pulled out a slightly withered cocklebur:

"That's what you take away from the field."

"At that time you were lying on the ground, your hair was entangled with the cocklebur on the ground, and you took the cocklebur away."

Seeing the seed hidden in his hair, the long-haired man's eyes widened immediately:

He didn't even feel it himself, but this kind of thing was on his body!

Damn...I knew I had a bald head...Long hair is harmful!

The long-haired man regretted for a while.

Then he reacted belatedly:

"No... this, this is just a cocklebur, what can it explain?"

"I have something like cocklebur at my doorstep. Isn't it strange that I get it on my body?"

"How can this prove that I have been to the scene?"

"idiot."

Lin Xinyi coldly extinguished the last hope in his heart:

"Just like humans, under natural conditions, the DNA of each plant is different."

"As long as you compare the DNA of the cocklebur on your body with the cluster of cocklebur grown on the spot, you will know where you got this seed from!"

"It's still like this?!"

The long-haired man was completely dumbfounded:

There is also this method of solving the case?

Plants can also do DNA testing?

"of course can."

Lin Xinyi replied confidently.

Although compared with the human DNA identification technology that has been used for many years in the field of criminal investigation, it is relatively difficult to apply plant DNA to criminal investigation.

And as a layman in biology, he didn't even know whether the relevant identification technology was mature in this era.

But Lin Xinyi has such confidence:

"It doesn't matter if the technology is immature..."

"When I finish publishing the thesis, I will naturally mature."

Chapter 389 Academic Misconduct

"you you…"

The long-haired man was taken aback by Lin Xinyi's arrogant remarks:

"What are you kidding?"

"Have you bullied me for not reading the book seriously? If you want to arrest me, can you still write the paper on the spot?"

"Sorry, I just can."

Lin Xinyi was so proud that he could raise his tail to the sky:

"You should read the newspaper more"

"The one who asked me this question last time, how many years has he been sentenced now?"

"I..." The long-haired man was momentarily speechless.

Only then did he suddenly realize that he seemed to have faintly heard someone talking about it:

Manager Lin of the Metropolitan Police Department was originally a young genius who graduated from Columbia University.

The elites of the famous international schools have both work and academics, which is not a problem at all.

The long-haired man himself didn't study much, and he was really guilty of being bullied by the "genius of a prestigious school" Lin Xinyi.

"No, no..."

In desperation, he still wanted to quibble:

"Even if the DNA of that xanthium is identified, it can prove that I have been to the scene."

"That can only prove that I have been to the scene, not that I killed someone!"

The long-haired man was right:

The cocklebur wrapped around his hair can only prove that he has been to the scene of the crime, and cannot directly prove that he killed the man.

but…

"It was enough to convince the court that your testimony that you had never been to the scene of the crime before was a lie."

"This in itself is an extremely unfavorable piece of evidence against you."

"Do you think the judge will believe what you said in court?"

Lin Xinyi asked coldly.

At the same time, he unknowingly recalled the interrogation method taught to him by Aunt Feili:

"At this point, if you want to clear your suspicions from your inconsistent confession, you can only hire the top lawyer to defend yourself."

"But the question is...Mr. Okada, can you afford a top lawyer?"

"I..." The long-haired man choked so hard he couldn't speak:

If he could afford top lawyers, why would he rob a bank?

After robbing the bank, there is money...

But that money is stolen money, and it hasn't been washed clean yet, so how dare you spend it now?

And Lin Xinyi's psychological battle is still going on:

"Not to mention, the cocklebur collected at the crime scene may also detect the dna you left at the scene."

"If this evidence is established, even if you have a top lawyer to help you, you will no longer have room for sophistry."

"So, surrender yourself..."

"It's useless for you to resist."

"I..." The long-haired man was completely desperate: "I plead guilty..."

He confessed his crime in despair, put on handcuffs honestly, and was escorted to the police car.

And Lin Xinyi and Belmode also took Caesar to join Conan, Hui Yuanai and others who stayed in the camp.

then…

"Zhibao...by comparing the plant DNA to confirm that the cocklebur on the murderer's body came from the scene of the crime, is it feasible with the current technology?"

Mr. Lin Xinyi, a "big scientist" who was confident in front of criminals before, was squatting shyly in front of a primary school student, asking questions carefully.

"It's doable, it's doable."

Hui Yuanai was like a little adult, holding his elbow with one hand and gently rubbing his chin with the other:

"As long as the plant DNA samples reflect a relatively wide diversity, the plant DNA identification conclusions are as reliable as the animal DNA identification conclusions."

"However, because there are too few precedents for using plant DNA in criminal investigation."

"So, if you want the court to accept the conclusion of the plant DNA comparison provided by you, in addition to identifying that the cocklebur is the same as the cocklebur at the scene of the crime."

"I still have to collect enough dna from the same kind of plants for identification and comparison."

"And prove the conclusion that the dna of each cocklebur is different."

In short, everyone's dna is different, which has been verified by a large number of scientific experiments.

Therefore, the police can directly apply this conclusion to criminal investigation, making the results of dna identification reliable evidence for conviction.

But at present, "the DNA of each plant is different, and the plant DNA samples can also reflect a relatively wide diversity", this conclusion has not been verified by enough experiments.

If Lin Xinyi wanted to use this principle to solve the case, he had to prove the principle himself first.

It's like when soldiers go to the battlefield, they have to burn coal to make steel and sharpen their knives first.

"The operation of identifying plant DNA is not difficult. Using the mature relp and rapd methods, it is easy to obtain the plant's DNA contour map."

"However, in order to make the conclusions have credible statistical significance, the number of experimental samples must not be set too small."

"At least... more than 30 cockleburs must be installed, right?"

"This kind of experiment will be a bit troublesome and time-consuming."

Hui Yuanai spoke methodically about his arrangement for the experiment.

As she spoke, she looked at Lin Xinyi with a more subtle expression:

"Wait... you..."

"You want me to write your paper for you again?"