The investigation of this case to the present can be described as a major discovery that has continuously subverted the nature of the case.

Whether it is the initial accidental death from heart disease, or the current suicide by poisoning and homicide, behind each case direction is a completely different direction of case investigation.

But now it is not without purpose, regardless of the nature of the case, the unique drug residues in the deceased's body have made Ren Jianyun and his Dujing Biopharmaceutical Co., Ltd. the absolute core of the case.

Of course, there is another important person who did not appear, and that is the person Sun Jinyu wanted to say sorry when he was dying.

But if the nature of the case does not involve homicide, then the person who is sorry is not so important.

"Team Lu, what do you mean when you just said that the scene is too clean?"

After listening to Lu Ke's words, everyone frowned, not understanding the meaning.

Lu Ke shook his head slightly, and said lightly: "I just think it's strange, I need to take a closer look......"

It is true that Lu Ke only instinctively felt that there was a problem, the perfect time of onset in the case, the requirement to clean up the bathroom first, the intact scene of the dispute in the living room, and even a large number of fingerprints pointing to the drugs of the pharmaceutical company, these were all very problematic.

But there are too many things in it that can't be figured out, and it seems that it is precisely because it is too perfect that it even gives Lu Ke an idea that someone is deliberately guiding the police's thinking of handling the case.

Solving cases is like this, it's not terrible to have confusion, as long as you sort out all the questions and answer them one by one, you can figure out all the questions.

Lu Ke pondered for a while, stood up, pulled the whiteboard from the corner of the wall to his side, took out the whiteboard charcoal pen and wrote a lot of words on it.

Every time he writes a question, he expands it and throws it at everyone.

"Now, let's put aside all speculation and inferences about probability, and only expand our analysis based on what we know so far.

What we can know so far is that Ren Jianyun has been in and out of Sun Jinyu's house frequently in the past six months, and often quarrels with Sun Jinyu over something. Aside from the personal experience of the cleaner Sister Liu once a month, the neighbor's description is more important.

Sun Jinyu's address is not an old residential area, and the sound insulation of the building is not so bad. Neighbors have heard more than once that there is a quarrel in Sun Jinyu's house, and we can imagine how fierce their quarrel will be.

So the question is, what are they arguing about? What is it that can make the two quarrel many times and not get a perfect result?

Ren Jianyun is a senior leader of Dujing Biopharmaceutical Co., Ltd., and can be said to be the de facto person in charge, especially in charge of the core drug research and development research projects of pharmaceutical companies.

And Sun Jinyu is just a small employee in the marketing department of a pharmaceutical company, and Ren Jianyun is still his immediate boss. Ren Jianyun came to Sun Jinyu to quarrel, and he must have taken the initiative. The boss went to the subordinate's house to quarrel, this kind of thing itself is relatively rare, and the more appropriate place is Ren Jianyun's office.

So why did Ren Jianyun quarrel with Sun Jinyu once every half a month on average? Even if the cleaner hears about the product sales question, the final decision is in Ren Jianyun's hands, so why is there any need to argue?

Is there anything that requires a small employee to nod and agree? ”

After speaking, Lu Ke drew a big question mark on the whiteboard.

No one present knew the answer to this question.

And this answer is also the key to solving the doubts in this case.

Lu Ke froze and continued to write the question on the whiteboard:

"The second question, where does the lethal drug come from?

The laboratory department has investigated the ingredients of the drug, which has never appeared in the market, so it should be developed by the pharmaceutical company itself.

Since drugs have lethal side effects, it is impossible to circulate them on the market, at most they stay in the research and development stage of drugs, and the amount is not particularly large.

As an employee of the marketing department, Sun Jinyu has no access to the core of scientific research projects, why does he have this medicine? ”

At this moment, Mo Yufei gave an affirmative reply: "So this medicine should have been brought by Ren Jianyun, combined with their long-term quarrel, it is very likely that they will poison and kill." ”

Lu Ke nodded, agreeing with Mo Yufei's opinion, but then asked rhetorically: "Then why does Ren Jianyun have this medicine?" ”

This question seemed a little strange, everyone was puzzled, only Su Simeng slowly spoke: "He is in charge of the scientific research team, of course he can get the medicine." ”

Lu Ke blinked and continued to write on the whiteboard: "Even if Ren Jianyun can take out illegal drugs from the scientific research laboratory without permission, even if the rules and regulations of the scientific research laboratory are not perfect, even if it can be found that the drugs with lethal side effects are not kept in a focused manner, even if Ren Jianyun really takes the medicine to Sun Jinyu's house, will he definitely choose to poison?" ”

This question is even more strange than the previous one.

After thinking for a moment, Ling Zizhen slapped him violently: "Indeed, isn't this a self-destructing identity?!" ”

Lu Ke smiled: "That's right, if there is really a contradiction that is enough to kill, isn't it good to go directly with a white knife and out with a red knife?" Now everyone knows that Ren Jianyun often goes in and out of Sun Jinyu's house and has conflicts with him, using his own poison, the house is full of his own fingerprints, why bother? In addition, if it is a crime of passion caused by a quarrel, poisoning will not be considered at all under impulse. ”

The topic has been talked about here, and the most critical question has arisen, whether Sun Jinyu was poisoned by Ren Jianyun?

"So, you mean, there is another mystery to Sun Jinyu's death?" Su Simeng asked.

Lu Ke twisted his fingers and wrote the last question on the whiteboard: "Whether it is homicide or suicide, death caused by drugs is a sure fact." And judging from the current clues, they all point to Ren Jianyun. But the strangest thing is that Sun Jinyu's death happened to be seen by the cleaners without destroying any of the scene. ”

Mo Yufei suddenly spoke: "Is it suicide?" ”

Lu Ke nodded and said in a low voice: "It's not impossible, because judging from all the layouts, it looks like suicide." He first deliberately let his neighbors and security guards see Ren Jianyun's figure, and then let the cleaner Sister Liu see Ren Jianyun many times and then quarrel with him.

Sister Liu's working hours are relatively fixed, so Sun Jinyu has the ability to control the time when Ren Jianyun comes to the door and happens to let Sister Liu see it.

Once everything is ready, it's time to control your own death.

But this is also the last key question.

How did Sun Jinyu get this lethal drug, and he could still know the efficacy and time of the attack? ”