Don't take the bean bag as a police dog

Chapter 141 Finding Engine Oil
The bean bun in front of the sample really smelled something.

The bean bag, which smells from the oil left on the thread, sits down in front of the target sample of the hidden car oil mixture, not in front of the machine lubricating oil hidden in various places.

This shows that what remains on the steel pipe thread is not the lubricating oil for machinery, but the oil for automobiles.

Now that the matter has come to this point, the persistent Li Lei has paid off.

If it is analyzed according to the oil used in automobiles, the suspect is likely to be engaged in the auto repair industry.

However, Li Lei is not satisfied with this. He thinks that since the bean bag is so amazing, it is necessary to further analyze what type of motor oil it is.

Zuo Dongliang was stunned. Dou Bao can tell the oil for a car, which is already very good, but it is really hard for a strong dog to tell what type of oil is for a car.

Zuo Dongliang analyzed it to Li Lei, saying that these engine oil residues may only be a mixture of various engine oils and other impurities. He only said that the composition of automobile engine oil is relatively large, and it is impossible to further distinguish the specific engine oil.

Li Lei said in disbelief: "Doubao is so amazing, we should give it a chance to break through!"

Since Li Lei wanted to make the bean bag dry, he had to do it. Before the bean bag started working, Zuo Dongliang and Li Lei said, don't hold out too much hope. Although the dog's nose is good, it is not a panacea.

Now there are seven target samples, namely mineral oil, semi-synthetic engine oil, and 0W-40, 5W-40, 0W-30, 5W-30 commonly used in fully synthetic engine oil (oils used at different temperatures) , the viscosity is different).

These oils are divided into three grades, the lowest grade is mineral oil, the middle grade is semi-synthetic motor oil, and the highest grade is fully synthetic motor oil.

Until now, Zuo Dongliang still doesn't believe that Doubao can tell the difference.

Before the start of the experimental search, Zuo Dongliang first used mineral oil as a target sample to hide, and then asked Doubao to smell the residual sample of engine oil on the thread and then asked Doubao to search, but he couldn't find it.

This at least shows that the suspect, who is suspected to be an auto mechanic, rarely performs mineral oil filling operations. This at least shows that this auto repair shop is not an ordinary small car repair shop. The cars repaired are not of high grade. It's too low.

Then, Zuo Dongliang hid the semi-synthetic engine oil again, and again used the sample of the engine oil residue on the thread as the source of smell, and asked Doubao to search, but he still couldn't find it.

This narrows it down again, which speaks to mid-range semi-synthetic oils, which this mechanic isn't involved in either.

The only possibility is that this garage only uses high-end fully synthetic motor oil.

So far in the search for Doubao, Zuo Dongliang thinks that the scope has been greatly narrowed.

Since low-end mineral oil and semi-synthetic motor oil are not used, only fully synthetic motor oil is left.

For the sake of scientific rigor, Zuo Dongliang asked Doubao to search again, and Doubao was able to find different types of fully synthetic motor oil hidden everywhere!
According to this analysis, this is a large-scale repair shop that only uses fully synthetic engine oil, and the grade of repair and maintenance cars should not be low.

Dou Bao's identification of engine oil at least draws the following conclusion: that is, this is a mechanic engaged in a slightly higher-grade auto repair, and the scope of the suspect's investigation has officially narrowed down to the auto repair shop!

Although the scope of investigation has been reduced, the workload everyone faces is still not small.

There are tens of thousands of auto repair shops in Diandong City, large and small, and even those small-scale repair shops with high-end business cannot be excluded. It can only be said that these repair shops are not low-grade.

Zuo Dongliang analyzed this conclusion, and the members of the criminal investigation team who were watching from the sidelines applauded, thinking that this was a huge breakthrough.

"Ah Liang, your interest in playing small steel guns has played a big role, but can you let Big Brother Doubao analyze what type of engine oil this is?" Li Lei said intensified.

Li Lei has always been the first to raise people and then restrain them, and he presented Zuo Dong with a difficult problem.

Zuo Dongliang took a deep breath and said, "Big Stone, you also watched the search process of the bean bag just now. It is already very good that the bean bag can tell that it is a fully synthetic engine oil. What else do you want it to do?"

At this time, Li Lei bypassed Zuo Dongliang, walked up to Doubao and squatted down, saying, "Doubao, do your best, and I'll get you a big beef bone."

When Doubao heard the word "bone", he barked twice excitedly.

"Did you see that Doubao is willing to do it, don't let me order you." Li Lei said to Zuo Dongliang with a smile.

It is also true, do what the leader tells you to do, this is the basic behavioral ethics within the system, Zuo Dongliang has forgotten this.

Although Li Lei is Zuo Dongliang's best friend, at any rate he is also a regular leader who is two levels higher than him, so he cannot be disobedient.

Before starting the search operation, Zuo Dongliang analyzed again: "Big stone, we are in the lower south, and the seasons are like spring. I am afraid that the engine oils used in the cold northern regions such as 0W40 and 0W30 can be directly ruled out."

Although you can't disobey the leadership, you can't waste time and police force.

Li Lei stroked his chin and thought for a while, then said, "Then why were the beanbags found just now?"

"This shows that the difference in the smell of these engine oils is very small, and the nose of the bean bag can't tell the difference." Zuo Dongliang explained.

At this point, Li Lei realized that he was a bit of a strong dog. He looked rigorous just now, but in fact there are still many possible experimental search processes, so he can only confirm that it is a high-end fully synthetic motor oil. In vain.

At this point, the three-hour test was over, and the scope of the investigation of the suspects was determined to be large and small repair shops in the city. This reduced the workload of the investigators, but the workload was still not small, but it gave a general direction.

As for the auto mechanics in the repair shop, they are actually people with certain skills. It is still possible for them to teach themselves how to make bombs.

It is worth pondering, what is the motivation of a person who majors in auto repair, learns bomb-making technology, and then bombs ATM machines, earning more than 20 yuan.

From Zuo Dongliang's point of view, Doubao's staged task has been completed now, and he should go back to the police dog team to recuperate. In the past few days, he has been eating and sleeping in the open, tied to a fixed position during the day, and has no room for movement at all. Doubao has already suppressed his emotions a bit.

So Zuo Dongliang suggested to Li Lei that he and Doubao should go back to the base to recuperate first.

Li Lei is naturally reluctant to let go of the god dog in his mouth, and wants to keep it. You can think about it. Now, where police dogs can be used, they have been used all over the place. When it is time to track down the suspect, it is estimated that Dou Bao will be able to use it. Space.

"Let's go after eating. I have prepared three days' extra meals for the bean buns." Li Lei pointed to the bean buns' refills in the corner of the duty station.

Zuo Dongliang still agreed, maybe the criminal investigation team will have a big breakthrough in the future, and he and Doubao will not be used to participate in the case in the future.

While watching the bean buns for dinner, Zuo Dongliang saw the steel pipe used for the crime in the corner, and thought, is this really the end of it?
Unwilling, Zuo Dongliang turned to the web page on his phone.

(End of this chapter)