Coroner Coroner

"Look at those iced oolong teas of the same style as 'poison tea'."

"The date of manufacture and serial number above."

Lin Xinyi reminded and ordered.

"Production date and production number?" The Mumu Police Department still didn't respond.

But Okiya Subaru has already realized his intention:

"I see…"

"The goods on the vending machines are all batch by batch, according to the 'box'."

"The vending machine management company purchases goods in batches and boxes."

"And the beverages in the same box, or even several consecutive boxes of beverages, are products produced continuously in the same factory, in the same production batch, on the same assembly line."

"So the production number on these beverage packages will be the same."

"The production date will also be the same day, the same hour, the same 1 minutes, and even the same second."

That is to say...

"Just compare the production numbers and production dates of this can of 'poison oolong tea' and the iced oolong tea in this vending machine."

"We can know that the murderer's poisonous oolong tea was bought elsewhere before committing the crime."

"I still bought it from this vending machine on the spot."

Lin Xinyi said the answer.

The Mumu Police Department finally understood his intentions.

After a simple comparison, everyone quickly found that:

"It's not the same... it's not the same!"

"The 20 cans of iced oolong tea stored in the vending machine were all produced on a certain day a month ago."

"But the production date of this can of 'Poison Oolong Tea' is very close, even this week, just three days ago."

"And judging from the production numbers and places of origin, their production batches and production plants are also different."

"The batch of oolong tea in the vending machine is produced at the Saitama Factory."

"This can of poisonous oolong tea produced this week is at the Chiba factory."

The answer is obvious:

"The murderer is not the iced oolong tea bought in this vending machine."

"He bought oolong tea elsewhere in advance, poisoned the tea, and brought it to this vending machine."

but…

The Mumu police department looked over again in a tangled manner:

"Knowing this, it seems that there is still no way to find the murderer?"

"Of course it won't help us find the murderer directly."

"But it can help us find a breakthrough."

Lin Xinyi sighed helplessly:

Now forensic methods are not working.

Then you should use the criminal police method to solve the case.

In the past, these ideas should have come from the criminal police team, which is equivalent to the search department.

As a forensic doctor, he just needs to do his job well.

But now...

Seeing that Mumu Police Department is used to lying down, and the answer is on his face, he still looks at a loss...

Lin Xin knew immediately that he would have to play a cameo role as the administrator of the first investigation class:

"The reason why the production number on the beverage exists is to facilitate manufacturers to distinguish the production batch of the beverage, and to facilitate emergency recalls and traceability investigations after quality problems occur."

"This investigative mechanism can be used to deal with quality issues, and naturally it can be used to deal with cases."

He paused slightly, and carefully ordered:

"Contact the manufacturer of this oolong tea, especially the Chiba factory that produced this can of 'Poison Oolong Tea'."

"Tell them the date of manufacture and the serial number."

"Let the manufacturer find out as soon as possible when this batch of oolong tea was put into Tokyo and the rice flower market, and find out which supermarkets, shops, and convenience stores have bought this batch of oolong tea."

"Okay!" Mumu Police Department nodded, and immediately complied.

The impact of this kind of "poison cola" incident is really bad. Faced with the huge pressure to solve the case, the Metropolitan Police Department also had to change its usual dull and bloated old state, and burst out with unprecedented efficiency.

And oolong tea manufacturers also know what this sudden "poisoned tea case" means——

If the case is not solved, no one will dare to buy his oolong tea.

And they are just a well-known local company in the Kanto region, not Coca-Cola, which had a big business and was not afraid of influence.

If this case is not solved for a long time, they will probably go out of business if they can't hold on.

So in a few minutes...

The oolong tea manufacturer, which received the notification from the Police Department for investigation, also responded quickly with a frightening efficiency:

"According to the production number and production date on the can, this can of 'Poison Oolong Tea' was filled and produced at 11:45:14 in the morning at [-]:[-]:[-] in the Chiba Beverage Factory, on the No. [-] assembly line in Workshop [-]."

"This batch of beverages left the factory yesterday and arrived at the warehouses of various distributors in Tokyo."

"From this morning to noon, the dealers put them on the market in Tokyo in turn."

"As for the supermarkets, shops, and convenience stores that purchased this batch of oolong tea...these have to be given a detailed list by the lower-level distributors."

"The oolong tea manufacturer is urgently contacting the dealer, and a complete list should be given soon."

The Mumu Police Department hastily gave the results of the investigation.

Lin Xinyi frowned.

Then there was a moment of deep thought.

"What, what's wrong?"

Everyone looked over in puzzlement.

At this time, I only listened to Lin Xinyi thinking carefully about the beverage sales information provided by the manufacturer just now:

"This batch of drinks was put on the market in Tokyo in turn at noon today."

"And the merchants who bought this batch of goods generally don't deliver the drinks they just bought to the counter on the spot."

"Even if the oolong tea on the counter happens to be sold out and needs to be replenished, it will definitely take some effort for the merchant to replenish and stack the goods at the counter."

"That is to say, the earliest time the murderer can buy this can of oolong tea is this afternoon."

Lin Xinyi quietly pointed out the key points:

"This time is not far from the time when the incident occurred."

"And Subaru Okiya has also analyzed it. Judging from the fact that Mr. Dejima still thinks the drink is 'cold', this can of oolong tea was just taken out of the freezer within 40 minutes before the incident."

"This..." Everyone lowered their heads thoughtfully.

Tetsuo Imai's expression on the side became a little unnatural.

"Mr. Lin, you mean..."

Miyano Akemi tentatively said with bright eyes:

"The murderer probably bought this can of oolong tea temporarily from a nearby store within 40 minutes before the incident?"

"That's right." Lin Xin nodded.

Then he turned his head to the Mumu Police Department and said:

"Megure Police Department, please mobilize as much spare police force as possible from the First Search Section, various divisional police stations, and local police stations."

"Combined with the list of purchase merchants provided by the manufacturer."

"Take this crime scene as the center, a 40-minute walk, no..."

"Within a 40-minute drive, all merchants who have bought this batch of oolong tea should be investigated."

"It's a supermarket, a convenience store... Even if it's a vending machine, you should ask the nearby businesses and residents if they have noticed that someone has bought this brand of iced oolong tea recently."

Lin Xinyi gave his method to solve the case.

"Huh?" Mumu Police Department was taken aback:

40 minutes by car…

If such a circle is drawn on the map, why not enclose half of Tokyo?

Even if there is a purchase list provided by the manufacturer, there are definitely not a small number of qualified merchants to be checked.

"There are so many stores... Do you have to check?"

"if not?"

Lin Xinyi sighed helplessly:

"Is it an easy job for a criminal police officer?"

The policeman is not a detective, and he can't solve the case immediately every time he slaps his head.

They're better at doing it the dumb way.

However, this stupid method of mobilizing a large number of police forces to "search mountains and seas" is something that no detective can learn or do.

Only a great collective can do that.

"So this is a case that a famous detective can't solve."

"Only our police can break it!"

Lin Xinyi cast an encouraging look at the Mumu Police Department: