F large, boys' dormitory.

A bed has been vacated, because there was an accident in the dormitory, which was promptly controlled by the police, and the other three people are temporarily sleeping in other dormitories in the class.

This dormitory, facing north and south, happens to be on the shady side, and only the towering evergreen leaves can be seen outside the window.

Inexplicably mixed with silky eerie tones.

Qianwan opened the cordon, slowly put on gloves, took the sampling tools handed over by Xiao Ran, and carefully looked at the ornaments in the dormitory.

The deceased became ill in the dormitory, although it was not necessarily poisoned in the dormitory.

But this toxin, he is the only one who has been hit.

It is unlikely to spread in a location where the public will have significant exposure.

The deceased's cups, kettles, and all other personal belongings may have been preserved as evidence.

Whoever walks through will leave traces.

Journalists were only allowed to stand outside the cordon and wait for the trace examination to end.

Qianwan used a cotton swab to scrape the gelatinous objects stuck to the side of the cup and the mouth of the kettle, put it in the test tube, handed it to Xiao Ran, and said coldly, "Seal, 5min, observe the discoloration reaction." ”

Xiao Ran nodded and put it in the inspection box.

After checking the deceased's personal belongings, Xiao Ran asked, "Do you want to go to the place where he is often active now?" ”

"Wait."

Qianwan glanced at the dust marks in the corner of the ground, her expression was awe-inspiring, her fingers measured its size, and said coldly, "Small water dispenser." ”

Traces of being moved.

And it's the last two days.

The wrinkles underneath are faint, indicating that someone has cleaned the place more than once after removing it.

Gao Zhengyi was taken aback, "Go and call the head of the deceased's dormitory over and ask where the things here have gone." ”

This is definitely not a murder of passion.

Hard-to-get chemical reagents, indecent ways of killing, calm and restrained clean-up evidence, this should be ......

It's been planned for a long time.

"This is an extremely rational murderer, there was no mental breakdown, and he even came to clean up the deceased's personal belongings, which shows that he was premeditated and did not panic."

Qianwan looked at the results displayed in the test tube, "There is alcohol and detergent residues, he washed it twice, or maybe it ...... The two men were each washed once. ”

Gao Zhengyi frowned, "Could this be his roommate who came to clean it up?" ”

When the head of the dormitory heard this question, he said timidly, "Officer, that, his things, I cleaned them with alcohol. ”

"I'm afraid that there will be toxins in it, and then it may affect the safety of other people, so I ......"

Qianwan squinted her eyes and looked at the head of the dormitory.

The voice was timid, but his eyes were staring straight at Gao Zhengyi, his body habitually leaning forward, and his fingers were half-clutched in his sleeves.

He's trying to convince others.

And the strength he embodies is contrary to this timidity.

"Who are you covering?"

Qianwan asked in a cold voice.

The head of the dormitory had a twitch of his lips, looked at her and said, "I don't have it......"

"There's a disposable paper cup in your place, there should be a water dispenser here, where did it go?"

“…… Sold. ”

He hesitated for 0.5 seconds and looked to the right.

Typical performance in thinking.

"I'll give you one more chance, where did it go."

The head of the dormitory clenched his sleeves, "We sold it." ”

Qianwan raised her eyebrows coldly, "You guys? ”

He pointed to the bed he had been unconsciously glancing at earlier.

"Team Gao, check the people in this position to see if they have cooperated with students from other colleges in scientific research projects, or if they can have close ties with people who have been in contact with chemical reagents for a long time."

"Okay."

The head of the dormitory's face changed, and he said in a stiff tone.

"Water dispenser...... On the first floor of the minus, abandoned warehouses. ”

Qianwan slowly hooked her lips.