As he answered, the lines on the polygraph screen climbed higher again.

In response, Karasawa simply recorded the answers truthfully and continued questioning, and the test was soon switched to the third person, the deceased's wife, Eri Yamamizu.

"Was the murder weapon used to kill Shanshui Mingqiu a tie?"

"no."

"Was the murder weapon used to kill Shanshui Mingqiu a vase?"

At this moment, when Sanshui Eri heard the question, her lips twitched slightly. Although she denied it, the instrument recorded all the indicators of her climbing truthfully.

After seeing this result, Nanatsuki Koshimizu went from understanding to experiencing.

Because they dissected the body and confirmed that the body was strangled by the tie, but Shanshui Eri reacted to the vase and thought that the vase was the murder weapon.

But both of them were "correct answers" on the polygraph, and it did test that the other person was lying.

This is a cognitive error that leads to an error in the result. If it is a completely new machine, then it will only get the wrong answer in the end.

Fortunately, during the last exchange meeting, he used the example of the "Arashiyama Amnesiac Man" to remind criminals everywhere to use machines objectively.

Otherwise, this new lie detector might cause a lot of trouble to criminal cases in various places because of its precise and powerful functions.

While Nanatsuki Koshimizu was finding a close friend, it was soon the turn of the last person, Mr. Hiroki Takase.

When faced with the question, "Was the murder weapon used to kill Shanshui Mingqiu a vase?", the other party seemed unmoved.

"Was the murder weapon used to kill Shanshui Mingqiu something like a belt?"

Although the answer was still negative, the instrument showed fluctuations.

Tang Ze glanced at Takase Hiroki and continued to ask, "Besides killing Shanshui Mingqiu, have you killed anyone else in the past?"

This was originally an issue unrelated to the case, and the other three people also got through it smoothly.

But when it comes to Hiroki Takase, his reaction was a bit too intense.

The trembling eyes and fingers, the rising heartbeat, everything indicated that the other person seemed to have had an unusual experience.

They also didn't expect that this fixed question mixed in the polygraph would actually screen out a criminal suspect who might have killed someone.

When I chose this question, I just thought that it would be possible to check whether any of the suspects had killed anyone before and was a potential murderer who had not yet been exposed.

It's a fixed rough investigation process.

But even Tang Ze did not expect that not long after this issue was finalized, they actually found a person who might be a problem among the suspects in a case.

However, Tang Ze still did not detain the other party, but watched him leave after completing the polygraph test.

"You won't leave this behind?"

Nanatsuki Koshimizu looked at Takase Hiroki's back and said, "That question just now must have alerted the enemy. What if he runs away?"

"If he runs away, it would prove he's the murderer, and that would save us a lot of trouble."

Tang Ze smiled and said, “Also, just because I asked him to leave doesn’t mean we can’t go over there.

Don't forget that he's still one of the suspects in the case. It's not illegal to send someone to watch him, right?"

"That's what I was saying." Nanatsuki Koshimizu laughed. "Even in this situation, you're still abiding by the rules. That's too rigid."

"This question was added to screen out murderers who are hiding in society and have evaded justice."

Upon hearing this, Tang Ze said, “Now that we have discovered a case, we naturally cannot let it go.

Of course, other possibilities cannot be ruled out, so the investigation into his possible murder is now left to you, is that ok?"

"Leave it to me." Koshimizu Nanatsuki patted his hand and assured with a smile.

Seeing her eager look, it was obvious that she was interested in this "murderer" identified by the polygraph.

After Yueshui Nanaki left, Tang Ze also looked at the responses of the four people to the questions asked by the polygraph and began to sort them out step by step.

After all, the questions are the same, but the reactions of several people are different, which means that their cognitions are different.

He also needs to eliminate some wrong options based on the current intelligence and further narrow the scope.

First of all, Hiroki Takase and Keiko Mihara reacted to the tape, and this alone increased their suspicion.

Because after the autopsy, it was confirmed that the deceased was indeed strangled to death.

But they haven't found the specific murder weapon yet, and that's another question.

Normally, only the murderer knows what he used to kill someone, but now two of them reacted to the murder weapon "the belt".

There are many situations like this. One is that the two people committed the crime together, so naturally they both knew the murder weapon and the method of killing Shanshui Mingqiu.

The other scenario is that two people committed the crime one after another. The first person thought he had killed Shanshui Mingqiu, but in fact he did not.

After waking up, Shanshui Mingqiu happened to meet the second prisoner. When the other party learned that Shanshui Mingqiu was almost strangled to death, he continued to kill the other party, wanting to use the "hitchhiking" method to inflict the crime on the first prisoner.

Therefore, as the suspicion of the two people increases further, further investigation is needed to find out who the real murderer is.

Of course, there are people whose suspicions are increased, and there are also people whose suspicions are cleared.

The deceased's wife, Eri Yamamizu, responded to the question, "Was the murder weapon a vase?"

If the murderer was killed by the vase, he would be the culprit, but unfortunately he was not, so Shanshui Eri was at most charged with intentional injury.

Finally, there is Kenji Koga, who responded to the issue of theft. Considering the envelope that Nanatsuki Koshimizu had found, perhaps he was the one who stole the envelope.

This chapter is not finished yet, please click on the next page to continue reading the exciting content!