Seeing the thoughtful appearance of Qi Yuan's clothes, Sister Chai raised her eyebrows slightly and said, "I'll give you another hint, ...... Lumino"

"I know." Qi Yuan waved his hand: "The luminol reagent is very sensitive to hemoglobin, even if it is diluted to the extent of one part per million, it can still emit a fluorescent reaction. Basically, it is impossible to wash away the blood stains by rinsing. ”

After a pause, he added, "So...... The killer must have changed his shoes when he left the scene.

Well, it must have been a change of shoes, it can't be wearing shoe covers or something, because in that case, the blood footprints on the scene will be a mess, and the patterns can't be so clear and distinct.

In addition, if he can afford to change his shoes, or if he can think of preparing a pair of laces in advance, then it is not difficult to bring an extra set of change clothes.

Then, it is very difficult for the colleagues of the graphic detective to rely on the surrounding monitoring probes and use blood stains or something to find out the suspect. No wonder, they worked all night and found nothing. ”

"That's good, Xiao Qi." Sister Chai nodded approvingly: "That's pretty much it." ”

After speaking, she looked at Liu Xun who was standing next to her and said, "Lao Liu, you can help me bring over the live photos I took yesterday." ”

"Okay!" Liu Xun nodded hurriedly, ran to Sister Chai's desk and flipped through it for a while, and then quickly brought a stack of photos and handed it to her.

After she took it, she took a quick look, then took out a few photos from it, divided them into two parts, handed them to Brother Song and Qi Yuan respectively, and said, "Now, this is the photo taken by the window, you two exchange and take a look."

So, while you look at it, I'll talk about it in general terms. Well, I won't go into too much detail about the specific speculation process, and I'll write it into the report later.

It can be seen that there are more footprints on the wall, only the forefoot, and there are obvious friction marks. There are two footprints on the window sill, and only the forefoot is on the sole of the foot, and the shoe arch area is just stepping on the window sill sliding rail, so the heel part is suspended in the air, leaving a complete footprint.

Because the shoe prints are incomplete, there are not many clues that can be deduced, and of course there are not many. First of all, judging from the pattern, he should be wearing basketball shoes at this time, well, this is the same as what he wore when he committed the crime......"

Speaking of this, she suddenly paused, paused, looked at Qi Yuan and asked, "Xiao Qi, what do you think about this?" ”

She seemed to care about Qi Yuan very much, and she wanted to take the school exam at every turn, or to give him some advice, obviously wanting him to progress as soon as possible, mature up, and truly integrate into the criminal investigation detachment.

When Brother Song saw it, his eyes took off the photo in his hand and looked up at him.

Qi Yuan also understood what she meant, so although he was stunned for a few seconds, he immediately used his brain, and then said uncertainly: "Can it be understood that he loves basketball shoes very much?" ”

"On the basis?"

"Two pairs of shoes, both basketball shoes." Qi Yuan replied: "Even if it was a shoe that might have been two sizes larger and almost impossible to wear in daily life, I still chose basketball shoes. This may be his subconscious move, as long as he looks at shoes and buys shoes, he only looks at this type. ”

Brother Song nodded lightly: "Yes, the reaction is quite fast." This is a reasonable speculation, and you can pay attention to it a little when you come to visit and investigate later.

Of course, don't be too influenced by this idea. I still say that unless you are 100% sure, don't believe any speculation, lest you form preconceived notions. ”

Sister Chai snorted, obviously agreeing with Brother Song's words, and then said: "Since you also think of this, then I won't repeat it, and then talk about another judgment - shoe prints on the wall."

Well, as you can see from the photos, the window is not high, and the window sill is only about one meter two or three from the ground.

Even if you instinctively rely on your feet to borrow strength, there will never be so many kick marks, and it looks like it is very difficult......"

She paused again.

But this time, without waiting for her to ask, Qi Yuan took the initiative to say: "Does this mean that his hands are injured, or he is holding something, so it is inconvenient to exert force, so it is difficult to even open a small window?"

Or maybe he is obese and has a severe decline in his ability to exercise...... However, considering that he may love basketball shoes, he shouldn't ......"

"Stop," Brother Song interrupted, "Who said fat people can't like basketball shoes?" ”

Qi Yuan scratched his head.

The corners of Sister Chai's mouth raised slightly, and she said softly: "It's almost the situation you said, and the clues that these footprints point to are these possibilities."

Generally speaking, Xiao Qi, your brain is not bad, although it is not a clue that is difficult to deduce, or buried deeply, but being able to think of it so quickly at least means that you are qualified in this regard and have the potential to become an excellent field policeman.

But the flaw is also obvious, that is, inexperienced, but like to take things for granted. This is not good, and we must pay special attention to it, we must always maintain objective reason, reasonable guessing and analysis, rather than subjective speculation.

Although the thinking of the Su team is also very out-of-the-box, he thinks about ten steps one step at a time, but he is different from you, he is very experienced, and he can basically guess nine out of ten, you must not learn from him at this stage.

Moreover, even if he is not 100% sure, he will not say it easily, so as not to mislead the entire direction of the investigation. ”

"Taught." Qi Yuan nodded seriously.

The relationship between him and Sister Chai is relatively special, many words, Brother Song may not speak directly due to the relationship, while Su Ping will not care about his face at all, he speaks too straight and too rigid not to mention it, and only gives a general direction, and the details will not be explained in detail at all.

Therefore, he listened to Sister Chai's words very seriously.

Seeing this, Brother Song showed a smile, patted him on the shoulder encouragingly, and then asked, "Director Chai, do you have anything else to discover?" ”

"That's all for now." Sister Chai shook her head: "Fingerprints or something, too many and too miscellaneous, and the suspect is suspected of wearing gloves to commit the crime, so there is nothing to find for the time being."

Of course, I don't think he was wearing gloves the whole time, at least after coming to the scene, before committing the crime, he should have been bare-handed.

Even if it is possible, we will not give up easily, so I will ask people to go through the fingerprints in detail, and in addition, I will go back to the site to re-investigate and re-investigate, and issue a systematic appraisal report. It will take time, though. ”

"Understood." Brother Song nodded, looked at his watch again, and returned the report in his hand, saying, "It's almost time, I'll take Xiao Qi out of the scene first, the other brothers are still waiting to arrange specific tasks." ”

"Cheng, you guys go." Sister Chai waved her hand: "During the interview and investigation, if we need to conduct a trace inspection, just call me directly." ”