The courtyard where the laboratory is located is a playground behind it. The snow melts, but the weather is dry and cold.

Under the cold moonlight, Maslow was preparing for activities. He had no exercise in the past six months. After running around, he felt a little panting.

"Slow, come on." A sound of footsteps came from behind, and Ju Hongfei's figure had already surpassed Maslow.

I know my physical fitness. As the worst person in history in Shanhai Police Academy's physical fitness and genius courses, Maslow dared not imagine that he could beat Ju Hongfei.

Ju Hongfei did not run around in front alone. He slowed down and waited for Maslow, "Jiang Xiaobai."

The figure in front was very familiar, and Jiang Xiaobai was running happily in sweat.

"Run together." Jiang Xiaobai greeted, breathing evenly and having a long stamina.

...

When Maslow finally lost his energy and sat on the chair, Jiang Xiaobai and Ju Hongfei also ran over with a smile. Under the moonlight, the three shadows were stretched long on the playground.

In this strange city far away from home, in this highly confidential and step-by-step mysterious place, the three of them came inexplicably this evening.

"Slow, do you have a girlfriend?" After asking this, Ju Hongfei immediately smiled, "I shouldn't ask this, I should ask where your girlfriend is?"

The eternal topic between men is women.

Boys who are thrilled during adolescence are still their biggest hobby in their tense free time.

Maslow looked at Jiang Xiaobai. Jiang Xiaobai turned his eyes to the distance. The wind on the playground was very cold, and the three of them were frozen in a while.

When he returned to the dormitory, Ju Hongfei pulled Jiang Xiaobai, who was about to leave, to Maslow's room, "Look, look at my girlfriend, is she very good in figure and very beautiful!"

The screensaver of the phone is a photo of Ju Hongfei and his girlfriend. I have to say that it is indeed very beautiful.

"Better than those young ladies on Douyin," Jiang Xiaobai praised politely.

"That was made with filters and beauty, this was purely bare-faced." Ju Hongfei retorted, "By the way, Xiaobai, look at your girlfriend, you two are the beauty here, where is your girlfriend?"

Jiang Xiaobai was embarrassed, but looked up frankly, "I've split up, she's gone abroad."

Ju Hongfei hurriedly said, "I'm sorry, I don't know."

Jiang Xiaobai smiled, "It's okay, the past has passed, and I've been no longer worried."

Maslow did not look at him and silently stroked his cell phone, and Lin Shuying appeared on the screen.

It is said that he is not worried, but if he is really not worried, there is no need to be embarrassed.

"Slow, is this your girlfriend? She is definitely at the school beauty level!" An Hongfei took the phone, "Beautiful, so beautiful!"

Maslow smiled, smiling proudly. During these days here, he always remembered the girl who snuggled up to him, always thinking, eating, and sleeping, but why not let them contact their home, school and friends?!

...

During the Spring Festival, fiery red lanterns hung on the walls, and the entire street of the horse-feeding courtyard was filled with lively crowds.

"Slow, I want to eat squid."

Maslow hurriedly ran over, but when he returned to his original position with his squid, he could no longer see Lin Shuying's traces.

Smurfs!

When he thought of that case, his heart suddenly became flustered, and as he looked around, "Slow."

Lin Shuying's voice appeared behind her. When Maslow turned around, Lin Shuying was smiling at him.

Crack Crack Crack –

Just as he was taking pictures of Lin Shuying, the sound of the camera could not stop, and Lin Shuying turned around and disappeared into the crowd.

Just when he was anxious, he suddenly woke up in this warm room.

"Bang bang bang--"

Then he found someone knocking outside, "Slow, Slow, wake up, have a task."

Maslow sat up.

…………………………………

…………………………………

The watch pointed at 1:34 a.m., and the police car quickly carried three people in the city, and the destination was Shangcheng District.

The police car turned on the lights, but did not pull the siren. Finally, it stopped in front of a hotel. When they walked into a room on the ninth floor, Chen Chong, also known as Ju Hongfei's master, had already stood in the room.

The people from the Shangcheng District Drug Control Brigade were also there. So many people stared at a young man of eighteen or nineteen in front of him. It seemed that he was about the same age as Maslow and others.

When the young man saw them, he glanced at him, but he still looked arrogant.

"Master, what's the situation?" Ju Hongfei took the initiative to approach Chen Chong.

Chen Chong pulled them aside and briefly introduced, "The drug trafficking suspect was arrested based on the preliminary investigation by the Shangcheng District Public Security Bureau's anti-drug brigade and Yingpan Street Police Station, but the drugs could not be found on him."

Ju Hongfei wanted to yawn, but he held back when he yawned, and there were drugs that Chen Chong could not find?

Maslow was very sleepy and was awake at this time. The three of them were still in the introductory stage. It seemed that Xingye called them here, but why did they still want to be called to the audience regardless of whether Zeng Li or Chen Chong encounter such a rare occurrence?

"You have no evidence. You can have a urine test to prove whether I sucked it or not." The young man looked decent, but he shaved his head and was shouting at the three of them arrogantly.

Once drugs are sucked, they will leave traces in biological samples such as urine, blood, saliva, etc., which will become evidence of illegal drug use.

Different types of test materials have different drug use retrospective periods. For example, the retrospective period of drugs in urine generally does not exceed 3 days. Once the urine test is positive, it usually indicates that the person being tested has used drugs within 3 days; the blood test is positive, which can indicate that the person being tested has used drugs within a few hours.

However, once the deadline is exceeded, no drug components will be detected in the blood and urine.

Some drug users will stop taking drugs a few days in advance according to the urine test time, and even accelerate the excretion of drugs by drinking more water and taking some drugs that assist in excretion.

Seeing his arrogant look, Chen Chong said to the comrades of the Municipal Drug Control Detachment, "Have the hair samples been tested?"

Compared with urine, blood and other test materials, the most significant advantage of hair samples is that it extends the drug retrieval retrospective period, can dig up drug respiration information for a longer period of time, and hair that is dozens of centimeters long can even reflect drug respiration situations within a few years.

Even if the urine test is negative, the hair sample can be positive.

However, he looked back at the bald man and felt a little difficult.

Hair samples detect drug use history, which mainly depends on the length of the hair. As long as the hair is long enough, such as the hair of a woman's hair that is tens of centimeters long, it can even reflect drug use within a few years.

But you can only extract a little hair from the young man in front of you.

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Chapter completed!