The Twilight Police Department turned its head a little weakly.

How incompetent the forensic class was, he knew very well in his heart:

The only thing these guys can do is hang around the crime scene with their cameras.

Not to mention looking for potential traces that are invisible to the naked eye, even if it is a "big guy" such as hair, earrings, dents, and thread marks, they often have to be reminded by detectives to find them.

The forensic class is so incompetent, as a result, every time a reporter comes, it is all a search lesson that is embarrassing on camera.

When I went back to see the leader, I was scolded for a search lesson.

What to do, don't do it, throw the pot first.

The evidence is invisible, and public funds play photography.

Thinking about it, the Twilight Police Department itself has some resentment towards the pig teammates in the identification class.

Originally, he instinctively rejected Lin Xinyi, a young man who was parachuted into the management officer, but now that he thinks about it...

Indeed, going to the identification class to be a management officer is the same as being a teacher in a kindergarten, and you will be autistic if you have a bad attitude.

"Well..."

Seeing the empty expression of the Dusk Police Department, Lin Xinyi sighed helplessly.

He turned his attention back to the case itself, then turned to the officers of the investigation department and said:

"Package me your site survey."

"Let me see what's in there!"

As he spoke, Lin Xinyi took the survey bag from the other party's hand regardless of it, and then opened it to take a closer look:

Tweezers, tape measure, gloves, shoe covers, scale bars, notebooks, markers, evidence bags, magnifying glasses, flashlights, ordinary brushes, fingerprint tape....

And then it's gone.

The only thing that can be regarded as a scientific and technological survey equipment in it is the fingerprint tape used to extract fingerprints.

The autopsy department is equipped with no people, and the survey department is equipped with no equipment.

Both sides are just the key places to dish, and the dishes are very level.

"That's the level of forensic class..."

"How did the Metropolitan Police Department solve cases before?"

Lin Xin asked in a capable way.

“......”

At this time, not only did the officers of the forensic division bow their heads to study the floor, but even the people who searched the first class still had hot faces:

How does the Metropolitan Police Department solve the case? Detectives, of course.

For a moment, the atmosphere was extremely awkward.

And Mr. Seba Zunde laughed in his heart, and almost stood up without patting the armrest of his wheelchair:

"Hahaha... This guy is still counting on the Metropolitan Police Department to help him solve the case? ”

"Today I won the game!"

With these thoughts in his heart, his expression became more steady.

But at this moment, I only heard Lin Xinyi sigh for a long time, and then said helplessly:

"Alas... This time I'll help you find the footprints and mudras. ”

"Remember to go back and fill up all the equipment for me, and learn some by yourself!"

"Huh?" Everyone was slightly stunned.

Especially Sewa Zunde, he was so frightened on the spot that his face changed:

"No, didn't you say that you don't have any equipment, and you can still find traces that are invisible to the naked eye?"

"Huh?" Lin Xin cast his gaze suspiciously.

"Ahem... I'm just curious. Sentoku laughed hard and argued.

"Absolutely."

Lin Xinyi retracted his eyes thoughtfully, and said in a firm tone:

"Although there is no professional equipment, it is difficult to find the exact location of the handprints and footprints."

"But this time the situation is different, we can basically infer the location of these traces through the facts of the case and the environment at the scene."

"As I said earlier, footprints can probably be found on balcony walls and handrails."

"And the mudra..."

He explained as he slowly walked to the front of the balcony.

It wasn't until he stood down in front of the door of the wooden-framed glass balcony that opened inward, that Lin Xinyi turned around and asked the servants present:

"Is this balcony door usually closed?"

"Hmm." The servant immediately replied, "This room has been unused, and we will close the doors and windows after cleaning." ”

"That's good,"

Lin Xinyi looked at the wooden-framed glass lattice door and continued to explain:

"The killer entered through the balcony, and it is very likely that he pushed the door open from the balcony."

"And this is a glass grille door, and if this door has been pushed open by the murderer, then we should be able to find the killer's handprint on the outside glass of this door."

"Come on..."

As he spoke, he beckoned to the officers in the forensic section:

"Come here, you can look for your handprints on this glass door."

"Yes!" The young officers gathered around.

Then, under the guidance of Lin Xinyi, they gathered around and looked left and right at the glass door.

And then...

"Nothing?"

A couple of Teletubbies looked over with such ignorant and innocent eyes.

"Hmm..."

Lin Xinyi covered his face helplessly:

"You don't know how to find potential handprints on the glass?"

"Didn't you sit by the window when you were in school?"

"Just puff at the glass!"

The Ha gas manifestation method is suitable for objects with smooth surfaces with weak water absorption.

This is a survey method that does not require any professional equipment at all, and only needs to have an open mouth to use.

And every student who has sat in the window position should have unconsciously used this method -

When you are bored in class, you can spit hot air into the window, and those handprints and fingerprints that you can't see can be clearly visible from the glass.

"I see!"

The police officers suddenly realized for a while, and suddenly rushed up to release their breath.

"Wait... Shut up! ”

"I'll teach you another way to do it a little easier."

Considering the air pollution that this method might produce, Lin Xinyi hurriedly stopped the overly enthusiastic students:

"Bring the flashlight."

"Illuminating from the back of the glass at a changing angle, and then looking at it from the front of the glass."

There is no professional multi-band light source, and there are always ordinary white light flashlights.

And Lin Xinyi is now using the transmitted light observation method that can be used only with an ordinary flashlight.

To put it bluntly, this method uses light to shine through the back of a transparent object, which is more suitable for investigating potential handprints on glass.

By constantly adjusting the angle, direction, and brightness of the light source, and adding an appropriate background, the contrast between the handprint and the background can be enhanced, and the handprint can be observed that is otherwise difficult to distinguish with the naked eye.

"Really, really!"

Looking at the blurred handprints that appeared in the light, the officers of the forensic section, who were paid millions of yen a year, were amazed like children doing science experiments for the first time.

Then, puzzled and worried, they asked:

"But Mr. Lin Xinyi, is this handprint a little blurry?"

"It's just that if you can see it with a flashlight, you can't compare it with the suspect's palm."

The handprints were indeed visible, but they were still not clear.

It is a little difficult to use this mudra to arrest people.

"It's okay."

Lin Xinyi said in a calm tone:

"Let's confirm the ownership of this mudra first."

"First of all, the handprint printed on the outside of the glass door does not have a palm print print, and the person who left this handprint should be wearing gloves."

"Secondly, it's not a sweat mudra, it's a dust and layer mudra."

As the name suggests, dust-clad handprints are handprints formed by touching a certain object with a dusty hand.

"The maids who clean don't have so much dust on their hands, and the same goes for Manager Yamazaki as a guest."

"And the murderer climbed the wall and climbed the balcony to enter the scene, and his palms and soles of his feet must be stained with a lot of dust from the outer wall."

"Gloves, dust, these two points are enough to prove that this handprint belongs to the murderer."

Hearing this, Sewa Zunde on the side had already swallowed nervously.

Indeed, he had just climbed the wall and pushed the door open with his gray-stained gloves.

At that time, he didn't see that he had left a handprint, but he didn't expect that when the boy surnamed Lin took a flashlight, he would show the invisible handprint.

Old Man Seba's heart pounded up and down like a roller coaster.

He gently wiped the cold sweat from his forehead, and secretly sighed in his heart:

"It's okay, it's a handprint that can't be seen clearly..."

"Otherwise, it's going to be a big problem."

He was thinking so in his heart, only to hear Lin Xinyi suddenly say again:

"Now that we have determined that the handprint belongs to the murderer, we can extract it."

"It's inconvenient to look at it with just a flashlight, but if you can extract it in the right way, you can further make it fully visible."

"Once you get the extracted handprints, you can compare them with the contours of the suspects' hands."

"Ahh Sewa Zunde's face changed, and he forced himself to calm down and pretend to be curious and asked, "Without equipment, this mudra can also be extracted?" ”

Isn't that killing him!

And in his nervous gaze, Lin Xinyi replied:

"It's true that the forensic class doesn't have any equipment to extract handprints."

"But... Mr. Sewa, you should have it at home. ”

"Huh?" Sewa Zunde was slightly stunned: "How can my family have it." ”

"Ugh...."

Lin Xinyi sighed slightly:

There was nothing in the forensic class, forcing him to use the local method from beginning to end:

"Wide tape."

"Just give me a roll of tape that's wide enough."