Don't take the bean bag as a police dog

Chapter 140 Narrowing the Scope
Early the next morning, when Zuo Dongliang woke up, he found that the three colleagues around him had disappeared, and even Doubao was still sound asleep.

It seems that after chatting with Shen Jing for a long time last night, the sleeping effect is quite good. In fact, during this period of time, Zuo Dongliang would occasionally suffer from intermittent insomnia because of the subtle changes in his relationship with Shen Jing.

Now it seems that talking more and communicating more with your girlfriend is the best medicine for insomnia.

Zuo Dongliang looked at his watch. It was only seven o'clock, and his colleagues had already left to enforce the law.

Zuo Dongliang came out from the duty station and saw a fast food box. It looked like breakfast for Zuo Dongliang. When he opened it, he found that it was roasted bait. It was probably for keeping warm, so he wrapped it in a fast food box.

As soon as Zuo Dongliang picked up the fast food box, the phone rang.

Those who called so early in the morning must not be parents or girlfriends, they must have arranged for work.

Sure enough, it was Li Lei who called.

Li Lei said that according to the analysis, organic oil remained on the iron water pipe, which shows that the suspect is likely to be a person engaged in machine repair related industries.

And this kind of engine oil residue is likely to be left on the suspect's gloves.

This is a big breakthrough!

If the occupation of the suspect can be determined, the scope of the investigation can be greatly narrowed!

Of course, in addition to surprises, there are also doubts.

There was very little engine oil left on the iron water pipes, and it was impossible for the technical investigation department to take samples for component analysis. Li Lei naturally thought of the police dog beanbag brought by Zuo Dongliang.

Hearing Li Lei talking enthusiastically, Zuo Dongliang murmured in his heart that the function of this engine oil is to lubricate. Although there are differences in ingredients, in Zuo Dongliang's opinion, most of the ingredients should be similar.

Zuo Dongliang understands automobile engine oil, because he likes cars, and Zuo Dongliang often talks with Shen Jing about modifying cars, so Zuo Dongliang can tell the reason for the types of automobile engine oil.

There are many industries that can use engine oil. With an objective attitude, it is really impossible to draw conclusions directly.

Specifically, there are automotive oil, mechanical oil, and even sewing machine oil.

So it's still a big range.

According to Li Lei's thinking, with such a strong search ability for beanbags, he should be able to identify the type of engine oil. Hearing this, Zuo Dongliang smiled.

"Big stone, why do you think this is a fantasy dog ​​movie? It's okay to identify the blood on this bean bag, but it's too difficult to identify the type of engine oil?" Zuo Dongliang said with a smile.

"Have you ever tried it? How do you know it won't work? Now I'll bring in different types of engine oil and let you tell the beanbags to distinguish them. Beanbags are the key to our case." Li Lei said firmly.

In Zuo Dongliang's view, the smell of different types of engine oil is a chemical smell. Although it is stronger than the smell of blood, it is really a test to identify the type of engine oil based on the smell of the engine oil. But according to what Li Lei said, How about not trying?
Probably, Doubao didn't know it at all. Its dog nose is now regarded as a magic weapon. Finding iron water pipes to find engine oil is simply the hope of the whole village.

Zuo Dongliang picked up the roasted bait that was cooling down and started to eat it. This made Doubao very excited and wanted to eat it, but Zuo Dongliang refused. Doubao was going to work soon, so he definitely couldn't eat.

……

Two hours later, Li Lei and Gao Yu came back together. Gao Yu was limping, probably due to the relapse of his old knee injury.

In the auto repair shop that cooperated with the Municipal Bureau, Li Lei asked for samples of various types of automobile engine oil, and even engine oil for other machinery, such as oil for injecting hydraulic machines and elevators.

Before Zuo Dongliang thought, Li Lei would not buy all kinds of engine oil, but now it seems that his mind is turning quite quickly.

From this point of view, Li Lei was really in a hurry and really wanted to make a breakthrough.

Just now, Deputy Director Bao Youwei was supposed to supervise the battle on the spot and understand the current trend. However, there was a meeting of the Municipal Bureau, and he had to attend, so the work meeting to understand the current trend of solving the case was temporarily shelved.

If the meeting was held at this time, Bao Youwei would probably be dissatisfied and everyone would be stressed.

Because at noon today, someone from the bank came to ask if the bank could be opened. If the bank is closed, it will be inconvenient for the surrounding citizens. The second is that the bank’s business cannot be carried out normally, which will have a great impact.

On the third day, if there is nothing to show for it, then it cannot be justified.

"Ah Liang, since there is organic oil left on the iron water pipes, and the composition cannot be analyzed, then we should treat them as if they were living horse doctors. My intuition tells me that the bean bag will definitely be able to tell what kind of engine oil it is!" Li Lei looked at the oil expectantly. Bean buns.

Li Lei really gave Zuo Dongliang various problems. There are many types of motor oil on the market now, including mineral oil, semi-synthetic motor oil, and fully synthetic motor oil. These are all different grades of motor oil. Zuo Dongliang understands.

But Zuo Dongliang didn't understand the engine oil for other machines.

Of course, Zuo Dongliang's nose couldn't smell what kind of engine oil was on the steel pipe, so he could only rely on the bean bag.

Suspiciously, Zuo Dongliang brought the various engine oil samples brought by Li Lei to Doubao.

Before, Dou Bao was familiar with various chemicals, but now it has become more difficult to distinguish the smell of engine oil.

Li Lei brought a urine test cup specially used to hold engine oil, which Li Lei asked for from the anti-drug team.

Speaking of these motor oils, they really smell the same, with a slight difference in smell, maybe those gods who participated in a certain powerful brain cooking in variety shows can tell the difference.

But from Zuo Dongliang's point of view, the difference in the smell of his nose is too small to be able to smell it at all, let alone tell what kind of engine oil it is from the remnants of engine oil on the steel pipe.

When Zuo Dongliang was working with the bean bag, Li Lei and Gao Yu were very nervous. They had been busy all morning, and they were afraid that when Bao Youwei came later, there would be no progress on their case.

In fact, the pressure from the leaders is small, and the pressure from the surrounding citizens is great.

Members of the criminal investigation team visited, and according to the surrounding residents, many nearby residents often do cash business, such as hawkers and the like, often deposit money here, and they have business in this bank.

Now that the bank is closed, they are backlogged at home, which is very troublesome. After three days, there are even complaints.

It is said that the affairs of the masses are no small matter, and it is good for everyone to solve the case as soon as possible.

"Doubao, search!" Zuo Dongliang started to make Doubao work after letting Doubao sniff the iron water pipe used for the crime.

In fact, seeing Li Lei and other members of the criminal investigation team so worried, Zuo Dongliang actually became nervous, but Zuo Dongliang didn't show it.

Because Doubao is very sensitive to the trainer's emotions, he cannot let Doubao be affected by the trainer's emotions while working.

It was a little disappointing that Doubao seemed not familiar with the smell of the sample when he was working, so his movements were a little slow, which made Li Lei and other criminal investigators a little discouraged when they saw this situation.

(End of this chapter)