When Ho Ka-fai saw the pinhole in the deceased's neck, he had already concluded that when the murderer killed the deceased, the deceased should have been in a coma or deep sleep.

Otherwise, if you suddenly get a needle in the neck, you will definitely wake up, and the deceased, as a doctor, has rich medical knowledge, and will definitely go out for help as soon as possible, and it is impossible to stay in place and wait for death.

There were no signs of struggle or struggle at the scene, and no injuries were found on the deceased's head, which can confirm that the deceased was not knocked unconscious.

So He Jiahui thought of sleeping pills.

Sleeping pills often contain a certain amount of tranquilizers, which is physiological hypnosis, and in this state, even if the neck is pricked, it will not be awake.

Under Ho Ka-fai's reminder, the forensic forensic team gave priority to testing the water cups, beverage bottles and food packaging collected at the scene.

Soon, Forensic also sent the information of the test to Huang Qiqi.

"We found two Starbucks disposable coffee cups in the trash can in the pantry, and in one of the cups, we found a reaction with imidazopidine, and after further testing, it was zolpidem.

Saliva was collected from the mouth of the coffee cup, and DNA comparison was underway, but the fingerprints of the deceased Liu Guoqiang were also found on the coffee cup, which can basically confirm that Liu Guoqiang drank this cup of coffee. Huang Qiqi replied.

"Zolpidem? The third generation of sleeping pills! No wonder it's undetectable in the blood. The half-life of zolpidem in the blood is only more than two hours, and the metabolism is very fast, so it is undetectable in the blood of the deceased. ”

He Jiahui paused, and then introduced: "After a person dies, the metabolism will not stop immediately, and it will continue for a period of time. It is not until after the cold of the corpse occurs that the metabolism stops completely.

Although zolpidem is no longer detectable in the blood of the deceased, zolpidem is metabolized by the kidneys, and if the deceased's kidneys are examined at the time of autopsy, it should still be detectable. ”

……

As early as the beginning of the twentieth century, scientists discovered that barbiturates have a sedative effect, and then successively synthesized some other sedatives, which are also the first generation of sleeping pills.

However, the effect of the first generation of sleeping pills is relatively poor, and it is necessary to take a moderate dose to improve the effect of sleep, and the impact between it and other drugs is also very large, which is easy to affect people's breathing, and will have adverse reactions to the central system.

The second-generation sleeping pills, mainly benzodiazepine sedatives, are also the most frequently used sleeping pills in clinical practice.

This class of drugs has a high therapeutic index, low toxicity to internal organs, and is relatively safe. However, the disadvantage is that the half-life is relatively long, and it can induce sleep after taking the drug, but it is easy to produce insomnia and anxiety after waking up.

You read that right, sleeping pills can have the side effects of insomnia after taking them, so many people will take sleeping pills, and insomnia will worsen.

And this kind of sleeping pills can only be dissolved in water in very small amounts, if the murderer intends to use this kind of medicine to drug people, it will be seen at a glance when placed in the water, there are some white solids floating in the water, and people with bad eyes can drink it!

However, this kind of medicine can be dissolved in alcohol, so there is no problem in the wine. In particular, foreign wine has a color, and it is almost impossible to see it when sleeping pills are melted into it.

However, doctors are not allowed to drink alcohol during working hours, so it is impossible for the murderer to use second-generation sleeping pills when he gave sleeping pills to the deceased.

The third generation of sleeping pills was not on the market until the eighties of the last century, and the oral absorption effect of this generation of sleeping pills is very good, and half an hour after taking it, it can reach the peak concentration in the blood.

Moreover, the safety of third-generation sleeping pills is also relatively high, and it is not easy to produce tolerance and dependence, as long as there are no allergies, there are basically no side effects.

Taking the more common zolpidem as an example, the half-life in the blood is only more than two hours, and it will only be metabolized by the kidneys.

It's not like a second-generation sleeping pill, it is metabolized by body fluids and milk, and if a lactating mother takes a sleeping pill and then feeds her child, the child will sleep with it.

Although zolpidem has a half-life of just over two hours in the body, it will soon become undetectable. However, zolpidem mixed in the drink has no half-life, so the forensic evidence can detect zolpidem residue in the coffee cup.

Huang Qiqi also used his brains at this time, and he said: "The deceased came to work the night shift, and he definitely won't take the initiative to take sleeping pills, so it should be the murderer who put sleeping pills in the deceased's coffee."

After the effect of the drug took effect, the deceased felt a little sleepy and went to the rest room to rest, and the murderer waited until the deceased was asleep, then entered the rest room and injected the deceased with an overdose of tranquilizer, resulting in the death of the deceased.

We have one more clue, as long as we find out who drugged the deceased's coffee cup, that person must be the murderer! ”

He Jiahui asked: "On the coffee cup, in addition to the fingerprints of the deceased, are there other people's fingerprints?" ”

Huang Qiqi instantly understood: "You are right, when the murderer takes sleeping pills, his hand will definitely touch the coffee cup, thus leaving fingerprints!" I'll ask forensics right away. ”

Huang Qiqi said, sent a message to Forensics, and after a while, Forensic replied with the results.

"The forensic evidence said that there were only the fingerprints of the deceased on the coffee cup, and it seems that the murderer was either wearing gloves or deliberately wiping the fingerprints off the coffee cup when he took the sleeping pills." Huang Qiqi said with some frustration.

He Jiahui pondered for a moment and said, "You just said that the forensic evidence found two Starbucks disposable cups in the trash can in the pantry.

Normal people don't drink two cups of coffee in one sitting, which means that there are two people drinking coffee. If two cups of coffee are bought at the same time, we may be able to find new clues about the killer from the other cup. ”

"How do you make sure you bought two cups of coffee together? There are more than 200 Starbucks coffee shops in Xiangjiang, and there are several within a five-kilometer radius of the hospital alone. It's normal for doctors to buy a cup of coffee before they come to work. Huang Qiqi said.

"Sir Huang, how long has it been since you bought your own coffee?" He Jiahui smiled slightly, and then said: "When you go to buy coffee, the coffee cup will be labeled, and there will be the type of coffee you bought, such as American, latte, etc., and there will be a number in addition to it. If two cups of coffee are ordered together, the numbers will be linked together. ”

"It's so simple, why didn't I think of it!" Huang Qiqi nodded suddenly, and continued: "I'll ask the forensic doctor right away." ”

Huang Qiqi sent a message to the medical examiner, and the medical examiner immediately sent a reply.

"You guessed it right, the labels on the two coffee cups are indeed serial numbers, which means that the two cups of coffee were bought together." Huang Qiqi said.

"Is there a fingerprint on the other coffee cup?" He Jiahui asked again.

Huang Qiqi sent another message to the forensic doctor to test it, and a moment later, the forensic doctor replied to the message.

"After comparison, Deng Qiaomei's fingerprints were found on another coffee cup." Huang Qiqi's face showed joy, and he continued:

"The murderer is really her! It should have been that she bought coffee for the deceased, then put sleeping pills in the coffee, and after the deceased fell asleep in the lounge, she went to kill the deceased!

Deng Qiaomei had a motive to commit the murder, and now that she has found the important evidence of the coffee cup, we can now detain her. ”

He Jiahui frowned, he didn't agree, because he felt that there were still many doubts. However, He Jiahui did not stop Huang Qiqi, after all, at this stage, except for Deng Qiaomei, there are no other clues.

Huang Qiqi immediately ordered a search of Deng Qiaomei's personal belongings, and at the same time, he took several other people to arrest Deng Qi's sister.

……

In a certain lounge, the doctor Cai Shude, and the two nurses Zhou Yuting and Deng Qiaomei all stayed here.

The three of them did not sit together, but apart from each other, and they were all separated by some distance. At the same time, all three of them looked at each other vigilantly.

The three of them are obviously suspicious of each other, but because of the affection of their colleagues, they barely maintain an average.

They all know that the murderer of Dr. Liu is among the three.

Staying in the same room with the murderer is naturally very cautious.

The door opened, Huang Qiqi walked in with a group of policemen, he came directly to Deng Qiaomei, and said:

"Ms. Deng, now I suspect that you are related to a homicide, and I need to take you back to the police station to cooperate with the investigation, you can remain silent, but what you say will become evidence in court."

"Me? Why me? Sir, are you mistaken? You're arresting people! Deng Qiaomei was suddenly surprised.

Deng Qiaomei showed a very uncooperative mood, and Huang Qiqi had no choice but to ask: "Ms. Deng, did you buy a cup of Starbucks coffee for Dr. Liu Guoqiang last night?" ”

"yes, isn't it normal to have a cup of coffee to refresh yourself on the night shift? What's wrong with that! Deng Qiaomei said.

"Refreshment?" Huang Qiqi sneered: "But in the cup of coffee that Dr. Liu Guoqiang drank, we found zolpidem, which is the main ingredient of sleeping pills. Ms. Deng, how do you explain this? ”

"Sleeping pills? How can there be sleeping pills in coffee? Deng Qiaomei looked surprised.

"Ms. Deng, now the police are asking you, not you asking the police!" Huang Qiqi continued: "Dr. Liu is here to work the night shift, not to sleep, he can't give himself sleeping pills, right?"

And Dr. Liu's coffee was bought by you, why are sleeping pills in it, shouldn't you answer this question? ”

"How do I know!" Deng Qiaomei replied instinctively.

"That's because you wanted to kill Dr. Liu, so you drugged his coffee, and when he fell asleep, you secretly went to the break room, injected an overdose of tranquilizer into his body, and killed him, right?" Huang Qiqi asked.

"No, I didn't kill anyone! How could I kill him! I'm ...... with him," Deng Qiaomei suddenly stopped talking.

Huang Qiqi opened his mouth and said; "Ms. Deng, you want to say that you have an improper relationship with Dr. Liu! We police have long mastered this!

And we also know that Dr. Liu is planning to marry his girlfriend and wants to end the relationship with you, and I guess this is your motive for killing!

You finally found Dr. Liu's son-in-law, but Dr. Liu planned to leave you and marry another woman, so you killed him in a fit of rage, right? ”

"That's not the case, I have a relationship with him, and I do resent him for marrying another woman, but I didn't kill anyone!" Deng Qiaomei hurriedly shook her head and denied it.

At this time, one of his subordinates walked in and whispered a few words in Huang Qiqi's ear.

Huang Qiqi's face suddenly turned happy, and he opened his mouth and ordered: "Send it to the forensic certificate for testing immediately!" ”

Then Huang Qiqi turned to Deng Qiaomei and said, "Ms. Deng, you said that you didn't kill Dr. Liu, but we found a used syringe in your closet in the locker room.

This syringe has now been handed over for forensic testing, and I guess it should be able to find the tranquilizer in it, right? You used this syringe to inject the deceased with an overdose of tranquilizer, causing him to die! ”

"Syringes? What syringe? Deng Qiaomei looked confused.

"At this point, are you still denying it? It doesn't matter, I can wait, our forensics are very efficient, and it won't be long before the test report can be transmitted. When the time comes, you will willingly go back to the police station with us. Huang Qiqi said confidently.

The efficiency of the forensic examination was really fast, and it didn't take long for the test results to be transmitted to Huang Qiqi's mobile phone.

"The forensic examination in the syringe detected midafilen, promethazine, and chlorpromazine, which are exactly the same as the overdose of tranquilizers detected in the deceased's body, that is, this syringe is the murder weapon!"

Huang Qiqi smiled triumphantly, and then said: "There are sleeping pills in the coffee you gave to the deceased, and the murder weapon was also found in you, and the chain of evidence is very complete!" Miss Deng, you need to hire a better lawyer! ”

After speaking, Huang Qiqi waved his hand and said, "Take people away!" ”

His subordinates immediately stepped forward and handcuffed Deng Qiaomei.

……

In the VIP lounge of the hospital, Song Keren was not idle while waiting for her grandfather's physical examination, she was reading the financial report of a subsidiary.

The old man who looked like a housekeeper walked in, leaned into Song Keren's ear, and whispered: "Miss, it has been investigated, the police came here because there was a murder here, and a doctor in the oncology department was killed."

However, the police have solved the case, the murderer is a nurse on the night shift with the doctor, she has an improper relationship with the doctor, and the doctor intends to marry someone else, so she killed the doctor in a fit of rage. ”

After listening to the housekeeper's narration, Song Keren immediately said: "No, the police must have arrested the wrong person!" ”

"It is said that the police also found the murder weapon at the nurse's place." The butler added.

"Tell me more about it." Song Keren said.

The housekeeper recounted the situation he had heard about in detail to Song Keren.

After listening, Song Keren shook his head: "This group of policemen really can't use their brains, and they can't see such obvious flaws!" I heard that Ho Jiahui was also involved in solving the case, right?

Didn't he notice anything unusual either? Hasn't he solved several bizarre cases in his information, it seems that it was just luck. I was still interested in him, but I didn't expect it to be just a straw bale with developed limbs! ”

(End of chapter)