Urban Reaper Forensic

Among the many pieces of evidence found at the scene, the most valuable evidence is a blood footprint extracted from the soaked floor using the luminol reaction.

This bloody footprint, measuring 26 centimeters in length, is preliminarily determined to be a male footprint, and the sole is a pair of leather shoes.

After comparing the footprints, it was found that this footprint was not the boss of the ship, it should be the murderer's. And it was the murderer who accidentally stepped on the victim's blood stains after killing the victim, leaving a trace.

Apart from this bloody footprint, there is no other valuable evidence to solve the case.

"With so much effort, you can only find a bloody footprint of the murderer?"

Ah Lei was depressed: "Then wouldn't it be a failure for me to go with my life this time and chase the boss of the ship?" "

Long Yichen stared at the bloody footprints left by the leather boot, and suddenly said lightly: "Not necessarily." In my opinion, this footprint can tell us a lot. "

"Yes, you're a medical examiner. How much information about prisoners can you find from this footprint? "

Are's eyes lit up.

Long Yichen showed a modest expression of "not much", but as soon as he spoke, it was like a machine gun, and he couldn't stop at all.

"Do you remember that in Sherlock Holmes' [Study of Blood Words], it was said that a man is seven times the length of his footprint?"

"I see!"

Ah Lei stood up excitedly and said, "The footprints of the prisoner found are 26 centimeters long, and the height of the prisoner is about 180!" This information is very important. "

"But..."

The corners of Long Yichen's mouth curled up a little, and he smiled slightly: "This is just an estimate of the people of the country of Ying in the Sherlock Holmes era." This estimation deviation is still very large, especially in the 19th century, there is a difference between the Ying Chinese people and our current Chinese race. Therefore, this estimate is only approximate. "

"So, you can't find the height of the murderer?"

Arey said depressedly.

"Who said that?"

Long Yichen smiled and said, "I happened to have conducted a study that proved that there is a formula for the ratio of height to footprint length for people in our area!" "

"The straight-line regression equation for male foot length and height is: y=93.55+3.26x, in the formula, y is the theoretical height and x is the foot length. In addition, the linear regression equation for the width and height of the male foot is: y=130.79+4.18x. In the formula, y is the height of the body, and x is the width of the balls of the feet. "

“····"

In the face of Long Yichen, who threw out the regression analysis equation without saying a word, Qiao Ying and Ah Lei, who beat his face, no longer wanted to speak...

Everyone is a goldfish, why are you so

"The length of this footprint is 26 cm, and when applied to the first regression equation, the exact height of the suspect should be 178.31 cm!"

"From the width of the footprint, put into the second regression equation, the conclusion is 178.57 cm!"

"The two conclusions are not much different."

"With this data, we know the exact height of the prisoner, 178 centimeters, and the left and right error does not exceed 0.5 centimeters."

“···"

Arei and Qiao Ying were already convinced.

"But that's not enough."

Long Yichen smiled lightly: "There is more information, which has also been leaked to us." That's what other characteristics of this person! "

"What? From a footprint, can you still know the weight of this person or something? "

"Of course," Long Yichen pouted, "but you need to get footprints in soft places, such as sandy beaches and mud, and use wax to pour wax molds to obtain accurate prisoner weight." But footprints can still give us a lot of information. "

"For example, this prisoner has the problem of flat feet."

Long Yichen pointed to the footprints: "Flat feet, commonly known as the collapse of the arch, such a foot, the footprints stepped on, the middle part is very clear, showing that the arch part of his foot is also under pressure." In this way we acquire another important characteristic of the prisoner. "

"178 cm tall with flat feet. These two characteristics can indeed greatly narrow the scope of our suspicions. "

Arey was excited.

This wave, although he did not catch the daytime vampire, his horse's feet were exposed one after another, and the outline gradually became clear, and it was not far from catching him.

"More than these two characteristics, he has a crossbow as a murder weapon to kill girls."

Long Yichen smiled and began to use the information he obtained from the daytime vampire using Uncle Cheng's death memory. In fact, he glanced at the daytime vampire in his memory and knew that he was indeed 178 tall.

"This crossbow is made of special steel and is also equipped with a precision killing sight. It is a lethal weapon strictly controlled by the state, and in general, individuals do not have the ability to assemble such a powerful and high-precision weapon. You can follow this line to check. "

Long Yichen looked at Are.

Arei nodded: "I know, this weapon is not produced by the underground arsenal, or it is a high-grade goods flowing in from abroad." I immediately ordered to go down and trace the lines. "

"In addition, the origin of this tin ship can also be checked."

Long Yichen raised his eyebrows and said, "The iron-clad ship should have been handed over to Uncle Cheng by the daytime vampire." When he bought the boat, he may have left some traces. "

"I'll check it too."

Arey nodded.

The three came out of the cabin and looked up, their brows furrowed.

"Smoggy days... Came up? "

Qiao Ying's brows furrowed, looking at the yellow haze that gradually shrouded in the distance.

"Oops, I forgot the weather forecast and said that there was smog again in the past two days!"

"Abominable!" Qiao Ying said angrily, "Can't we govern this smog day?"

Seeing the smog coming, a haze rose in the hearts of several people...

On a smoggy day, is this crazy vampire going to come out to commit crimes again? _

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