Although Li Luo is preparing to implement the identity system and manage population mobility, the preparations for this matter are complicated after all, and it cannot be achieved in a short while. At least now, he is still rushing to prepare a certificate.

But the Tang State system was very efficient. After several orders, the police department, the Constitutional Administration, the Special Inspection Bureau, and the Siyi Temple all started to move.

As soon as the drums sounded from the Jingzhao Yin Yamen, the police officers quickly notified the police stations and the yard was in full swing. In less than an hour, the people in the city were alarmed.

The entire Lin'an City was also martial law, and everyone knew that Lin'an might have infiltrated the Yuan court spies, carrying epidemics that could infect humans.

The whole city is frightened, as if facing a great enemy.

In fact, the ancients were not as ignorant as later generations thought. Although ancient doctors did not know the principle of infectious diseases, they knew it was a disease, not caused by ghosts and gods.

In the Song Dynasty, the means to prevent plague were already perfect. The Song court established the world's earliest plague prevention and control mechanism, and the isolation measures to prevent cross-infection were more scientific.

At least the people knew that it was a poisonous disease that caused harm. Instead, a group of Confucian scholars who "believe in" the response of heaven and man, pretended to be confused and tried every means to pull the will of heaven, with the purpose of making the emperor obedient.

The emperor was not confused, and most of them understood that it had nothing to do with the will of heaven. But in order to prove that he was the emperor and had the ability to sense the heaven, he could only pretend to be confused and pinch his nose to accept it.

That's all nonsense.

For example, the Qing Dynasty and the Mongol Emperors really believed in Tantric Buddhism? How could it be?

It's just for the sake of rule. Kublai Khan and Kang Mazi respected the great lama on the surface, but how could they really take it seriously in their hearts? It's just a tool.

When Lin'an people heard that the Yuan court spies brought in a marmot that could make people sick, they had killed more than a dozen people. They were shocked.

Just say, how could the Tartars be so peaceful? That would be the only way to go without making any bad things.

When the Tartars advanced southward, there was a plague in more than one place. This is not new.

All the people from other places were spontaneously monitored by the people and reported to the officials one by one.

At the same time, the Medical Bureau of the Ministry of Medicine also urgently ordered the collection of medicinal materials such as Astragalus, Coptis chinensis, Yinqiao and other medicinal materials according to the queen's instructions. As far as Cui Xiuning knows, these are already the best anti-plague Chinese medicines without special anti-plague drugs such as streptomycin. Although the effect is not very good, it is much better than none after all.

With the cooperation of each yard, the police officers isolated all outsiders and temporarily placed them under house arrest. Then they compared and interrogated one by one? They ruled out one by one.

But until noon the next day, hundreds of suspicious objects were ruled out of spy? But the suspicious Northerner was still not found.

Dozens of isolated patients also began to die one after another.

The doctors also "fully armed" to give them medicine, and finally stabilized the people with milder symptoms? Reduced death.

Soon, the counties and villages around Lin'an also took action after receiving the order. They were checking suspicious northerners everywhere. At the same time, the government agencies in various places were also collecting medicinal materials such as Astragalus and Coptis chinensis. They organized local doctors to prepare for the fight against the epidemic.

Then?   In the afternoon, no suspicious characters were found.

Cui Xiuning took three foxes and sat in the police department to personally direct the case to solve the case.

These three foxes were not trained successfully? They can only say that they were half-finished? They definitely can’t catch people. It should be no problem to find people. See if they can make contributions this time.

There is increasing evidence that this is a premeditated crime.

Report on the police's investigation results? The man was a middle-aged man with a northern accent and looked like a northern accent. He was a little fat and tall. The neighbor remembered that the man was carrying a load while staying in the room.

This person will not be more than seven days after coming to An.

The question is, is he still in Lin'an City?

Lin'an is the largest city in the south of the Yangtze River, and there are many people entering and leaving every day. Lin'an City is also very large, with a large number of buildings, and its population has now increased to more than 500,000.

In short, finding someone is not easy.

If this person brings enough dry food and water and hides in a corner, he will be able to stay out for ten days.

"This person once carried a burden. Needless to say, it must be the marmot that had started to get sick." Cui Xiuning changed into a policeman's black robe, looking very capable.

"A sack was found at the scene, a marmot that died of illness. So, what about other marmots?" Officer Cui was very tempted.

"Also, marmots are ill and die, and there will be up to seven or eight days in the middle. Now that the Yangtze River is blocking, how did he bring marmots from the north to Lin'an in these seven or eight days?"

Cui Xiuning knew that marmots are high-altitude cold-zone species. Even Hebei is rare, let alone the south.

A large group of policemen looked at the teacher, frowned and thought.

The teacher once said that the plague broke out to the point where it suddenly died. In such a few days, it was impossible for the man to bring the marmot to Lin'an when the Yangtze River was blocked.

It is difficult to smuggle at night. Because since the end of the war, many river defense soldiers have been stationed along the south bank of the Yangtze River. Even if this person smuggled over in a sheepskin raft at night, it is difficult for him to escape the eyes of the river defense patrol soldiers, and the risk is too great.

So the marmot must have been brought by the North.

How did the question come about?

Could it be that this person knows which marmot will get sick?

If you know what kind of marmots will get sick, then you can count on time. When the marmots go south before they get sick, they just happened to get sick when they arrive in Lin'an.

Is this too mysterious?

Just like a doctor, can you know in advance that someone will get sick?

Cui Xiuning couldn't guess when she saw the students, and it was not surprising that the professor said: "Many marmots carry bacteria themselves, but they just don't get sick easily. Well, this is called immunity, you can think of it as a shield of the human body. Everyone has bacteria on their bodies, but they are not easily sick. It is because of this shield."

"Once a person goes to a place where the environment is not suitable for the environment, or suffers from wind and cold, his immunity will decrease, and when the shield is broken, the bacteria will take advantage of the situation."

"This is true for humans, and so is marmots. When they are in the north, they must be lively and roaring. But if they are taken to the humid and stuffy Jiangnan, they will most likely become ill. Once they start to get sick, the contagiousness of the plague will increase several times, which will easily harm people."

The police officers suddenly realized that if they were as follows the teacher's statement, it might be true.

Since the marmot had not been ill, of course, the man had enough effort to bring the marmot into Lin'an before the marmot died.

Only this one explains it.

So, first, that person must have come from Tubo. Second, that person is very familiar with the habits of marmots and should not be a Han person.

"So, since that man was carrying a load and came from afar, he would definitely bring more than one marmot. He could not have no horses on the road. Where are the other marmots? Where are his horses?"

"Also, why did this person go to Guhuaifang? Instead of other places? Why did he know the existence of Guhuaifang?"

Cui Xiuning said, while lit the city drawings of Lin'an and drew a circle at the Guhuaifang.

"Okay, I'll inspire so much. The matter is urgent, I will only give you a quarter of an hour to answer. If you can't answer, then I will only be the one who will go to the front line to arrest this case myself."

She looked at her students very much, hoping that they would not let themselves down.

Soon, a student said, "This person came from thousands of miles away and must have a horse, and there must be more than one horse. According to Lin'an City Rules, it is difficult for horses from other places to enter the city, so his horse can only be kept somewhere outside the city."

"This person has most of his accomplices, who are responsible for looking at the horses and luggage. He is ready to pick up the spies in the city to escape at any time."

Cui Xiuning smiled and said, "Very good. Since you doubt this, take people out of the city immediately and catch people by looking for horses! Remember, you have to live! Take Xiaohui!"

"No!" The police officer immediately led the gray fox and rushed out to make arrangements.

The second police officer said: "Teacher, the student knows why he chose Guhuaifang. Because Guhuaifang is not only densely populated, but also has a characteristic, that is, the walls of each house in the yard are open, connected in all directions and have doors. Therefore, the frequent movement of residents in the yard is conducive to the transmission of disease. However, he could not have imagined that we were moving so quickly."

"Secondly, it is also helpful for him to release other marmots and wander around the yard. So students guessed that there might be other marmots in the ancient locust house, maybe they were not dead yet, but they dug holes to hide."

"Very good." Cui Xiuning nodded, "Then go and do it quickly, take Xiaobai there, search the Guhuaifang carefully, and find other marmots."

"No!" The police officer also rushed out to make arrangements with the white fox.

The third student also said a little excitedly: "This person could not have thought that we would respond so quickly. According to criminal psychology, it is impossible for him to leave Lin'an immediately after taking action. Instead, he should hide in the dark to observe the outbreak of the plague. If the plague does not break out, his mission failed and he is unwilling to leave."

"So, this person is probably still in the city. But why can't he be found? Lin'an City's national mobilization, where else has not been investigated? There is only one place, Phoenix Mountain!"

At halfway up Fenghuang Mountain is the Zhao Song Palace and the Li Tang Palace. However, Fenghuang Mountain is very large and the palace only occupies a small area. Except for the surrounding area of ​​the palace, other areas are relatively desolate. If this person escapes into Fenghuang Mountain and digs a hole in the mountains to hide, it will be the safest.

Choi Xiuning nodded, "No, that's what dark under the light."

The police officer was shocked, "I'll take someone to arrest him!"

Cui Xiuning shook her head, "No need. Not long ago, I had ordered the entire Phoenix Mountain to be blocked, surrounded by thousands of soldiers. If that person really wants to be in the mountains, he will be unable to fly."

Everyone looked happy and it turned out that the teacher had blocked Phoenix Mountain.

A student said: "This person is not familiar with the place, but he can know that the ancient Huaifang is most likely to spread diseases, and know where it is most likely to hide people. Then there must be an insider in the city."

"However, how can a stranger from the north directly find a local person as an insider? The most reasonable explanation is that this insider is not a local person, but may also be a northerner, but just comes first. The insider may come first for a while and can only become an insider after understanding the situation in Lin'an City."

Cui Xiuning nodded in praise, "No, then let's do it. Within half a year, all the Beidi people who came to Lin'an to live as key objects will be controlled and interrogated one by one. If they find the suspect, they will be sent to the Special Inspection Bureau."

"No!" The police officer also excitedly made arrangements.

Then, Cui Xiuning took people to Guhuaifang himself.

Although Cui Xiuning had received the plague vaccine, she still took protection and then took police fox Xiaohei to the scene of the crime and collected the smell on the bed where the suspect had slept.

What canines fear most is rabies, but they have strong immunity to plague. Therefore, wolves and foxes on the grassland often prey on marmots and other rats, but rarely get infected with plague.

Wolves and foxes are important species to reduce plague outbreaks.

Finally, Cui Xiuning took "Xiao Hei" to track it. The man must not like to take a bath, leaving the smell very strong. Xiao Hei kept searching with the smell, but instead of going to Phoenix Mountain, he found Yongkangfang.

At this time, there were already many police officers and military police in Yongkangfang, searching for the insider. Xiao Hei found a doorstep of a family and was seeing a northerner being taken out by a policeman.

"Official, I haven't broken the law. I have been in Lin'an for several months and have settled in Lin'an." said the northerner.

Although he spoke Zhongyuan dialect, his accent was a bit weird and he was not very skilled. He should not be a Han person.

A policeman said, "You didn't say you broke the law, just go to the policeman's hall to cooperate with the investigation first."

The man looked dissatisfied.

Choi Soo-ning looked at him and said to the policeman: "He is the inner supporter. Take it down!"

Several policemen rushed up and twisted the man.
To be continued...