traces of all things

Maybe it was a delay in buying mineral water. As soon as he came out of the teaching building, Tang Shaoyuan found that his seat had been taken by someone else.

I don’t know if it’s because the students had finished their meals at this time, and there were suddenly many people on the empty basketball court just now. Two young tall boys were talking and laughing with Lu Zheng on the court. There were a few long-haired girls outside the court, their faces were flushed, and they looked quite excited, pointing at the basketball court in a cryptic manner.

Tang Shaoyuan's footsteps became slower and slower, and finally stood still less than ten meters away from the field.

The hustle and bustle on the court seemed to fade away gradually, and it had nothing to do with him anymore.

This scene is so similar to everything in the past.

The high school and junior high school of the High School Attached to Normal University share the same playground. Every day after dinner, you can always see a group of young men running to the basketball court to sweat with friends and companions.

Lu Zheng is often the one surrounded by the crowd.

And he could only swing back and forth outside the green barbed wire of the stadium, pretending to hold a vocabulary book.

At that time, the green belt outside the stadium had not been removed, and his figure was not very clear across a circle of bushes, so he was not worried about being discovered.

The short-haired boy on the court received a wonderful pass from the black-skinned boy, made a fake move, and swayed past the defender in front of him quite flexibly to send the ball into the basket.

"brush--"

"Good shot, Old Road!" The black-skinned boy rushed forward, and the two clapped hands tacitly.

There was a group of little girls on the sidelines who were always watching, and when they saw this, they whispered excitedly, stomped their feet and clapped their hands in excitement, and the bolder ones screamed at the top of their voices: "Lu Zheng is the most handsome!"

When Lu Zheng heard it, he smiled happily, the dimples on his face were shining brightly, he made an "OK" gesture in the direction of the sound, and shouted loudly: "What a coincidence, I think so too! "

The girls burst into laughter.

The boys who were playing together looked at each other, but couldn't see his snarky appearance, so they rushed over and ravaged Lu Zheng's short hair. The worst thing was the black-skinned boy, who immediately started to scratch his itch Meat.

"Hahahaha, no, Qin Han, you idiot... Hahahaha, spare me! I was wrong! You are the most handsome! Qin Han is the most handsome in the universe, right?"

Under Tang Shaoyuan's envious eyes, this impromptu 3v3 match ended with the crushing victory of the three of Lu Zheng and the others.

When a few boys were drinking water and preparing to break up and go back to their evening self-study, there was a sudden commotion among the girls over there. A little girl wearing a school uniform and wearing a very fashionable long hair was surrounded by several girls and stood. When he came out, his face was flushed, and he was holding a small pink box with a letter in his hand.

"Oh oh oh oh oh oh--!"

The boys who played ball knew what was going on, and they seemed to have been beaten for a moment, and they dragged Lu Zheng in front of the little girl without thinking about the excitement.

The little girl blushed and stuffed the things in the hands of the short-haired boy, and muttered a few words, which Tang Shaoyuan, who was on the sidelines, couldn't hear clearly even though he was digging through the barbed wire.

"Together with!"

The boys onlookers booed loudly and winked, very obscenely.

Seeing his idols standing there with all the stars holding the moon, he should have felt envious, but for some reason, Tang Shaoyuan felt a kind of sadness that he had never experienced before. He suddenly didn't want to hear Lu Zheng's words Answer, turned and ran away in one breath.

His sports are very bad, and this is the first time he ran so fast. After a while, he stopped out of breath, found a place on the edge of the flower bed to clean himself, sat down, and took out the He opened a gray wallet, stared blankly at it for a while, sniffed and pulled out the photos contained in it, threw his hand into the flower bed with an angry look, and left without looking back.

2 minute later.

A figure ran back out of breath, and got into the flower bed directly.

**

Recently, the court of the Provincial Department hadn't been repaired, and the basketball court of Geng Panpan's elementary school nearby was demolished, so Lu Zheng and Tang Shaoyuan ran a little longer and came to the court of the Provincial Normal University.

The provincial capital Normal University is the best comprehensive university in province A, and it is quite well-known across the country. In the early years, basic subjects such as mathematics, physics and chemistry did well. In recent years, it has merged several other humanities and social sciences in the provincial capital. After the school, there are obviously more beautiful girls in the school than before.

Just like the few watching around the basketball court now.

There were two excited girls who kept pointing at Lu Zheng, one of them had long straight hair with bangs that had been permed, and her smooth, shiny and beautiful long hair was swept away by the wind. It fluttered slightly, just like the girl who confessed her love on the court back then.

Tang Shaoyuan squeezed the mineral water bottle in his hand, suddenly feeling a little upset.

Hey, until now, ion perm long straight hair is still the most unpleasing female hairstyle for him, not one of them.

He was hesitating, when he suddenly saw that the ion hot sister raised her mobile phone and quietly pressed the shutter in the direction of Lu Zheng on the court.

Before his brain had time to think, Tang Shaoyuan's feet moved unconsciously, and with a pair of long legs, he ran behind the ion hot sister after a few steps.

"Hello." Regardless of his politeness, he said gruffly, "Delete the photo."

The two little girls had seen a strange handsome guy on the basketball court, secretly communicating with each other. Although they knew that it was not good to take pictures without his permission, they secretly took out their mobile phones after the battle between heaven and man.

A low shout from behind startled the two of them enough, and they turned around to see but were stunned.

When did the Feng Shui of the school get so good!Another white and beautiful long legs!

The long-legged handsome guy seemed to have a bad temper, and said again in a cold voice with a stinky face: "Quickly delete it, it's immoral to secretly take pictures, you know that?"

The two girls were terrified by his vicious aura, and they didn't care about the nymphomaniac, so they hurriedly opened the phone photo album with shaking hands.

"What's the matter, Shao Yuan?" Lu Zheng over there noticed the movement here, and immediately left a few new friends on the field and came forward, his round eyes didn't look at the two beautiful girls in front of him, but took a little The child looked at Tang Shaoyuan inquiring and worrying.

For some reason, Tang Shaoyuan immediately felt at ease.

With a straight face, he filed a black complaint without any psychological burden like a kindergarten kid: "Senior brother, they secretly took pictures of you."

Although Tang Shaoyuan was expressionless, Lu Zheng actually read a little grievance from his face.

It's really evil.

He patted him on the back twice soothingly, smoothed his hair, and then Lu Zheng turned around and slammed into the ion iron, showing a friendly smile to the two of them: "Have you opened your face yet?"

... This style of painting seems to be a bit wrong.

"No, no..." The two little girls froze for a moment.

"Hey," Lu Zheng shook his head and sighed exaggeratedly: "Don't spread the word, I have the burden of being an idol."

"It's been deleted." Ion Tang blushed a little, and Tang Shaoyuan was tired of seeing it, so he simply looked up at the sky.

"That's right." Lu Zheng smiled, and half-truthfully taught: "Don't do it again in the future."

I don't know if this is talking about beauty or candid photography.

Tang Shaoyuan was startled, as if he just remembered something, he clutched his trouser pocket with a guilty conscience.

Lu Zheng next to him looked very kind, and he wasn't too angry. Instead, the two little girls felt a little embarrassed, blushed and apologized to them, and walked away with a shy smile.

People are gone now.

Lu Zheng looked back a little funny, and found that Tang Shaoyuan was holding his trouser pocket on one side. He didn't know what he was thinking, so he elbowed him and took a bottle of mineral water from his arm: "Here mine?"

"……Um."

"Thank you buddy, eh——? This is yours?" Lu Zheng twisted hard, but he didn't expect that the bottle cap in his hand would be unscrewed easily. He made too much force and almost deformed the bottle.

"No." Tang Shaoyuan stopped looking at the sky now, but looked at Lu Zheng through the lens watery, a little shy: "I opened it first, the cap of this brand is a bit difficult to twist..."

"My God, Shao Yuan." Lu Zheng shook his head.

Tang Shaoyuan felt uneasy, afraid that Lu Zheng would think he was meddling in his own business, but he did not expect him to sigh sincerely: "I have never met such a caring person like you in my life."

Bang bang bang fireworks exploded for a while, and Tang Shaoyuan felt that he was going to fly into the sky to stand shoulder to shoulder with the sun.

**

Until he and Lu Zheng found a place to sit by the flower bed next to the basketball court, Tang Shaoyuan was still immersed in sweet joy and couldn't extricate himself.

Seeing that he was a little empty again, Lu Zheng couldn't help laughing, and helped him wipe the area carefully several times: "What's the progress on Pingqu?"

Two days ago, Tang Shaoyuan didn't have time to come out to practice with Lu Zheng because there was new news about a case he had been following up before, and he needed to go to Pingqu County.

"There is no problem with the family tree, and the suspect has been detained." Mentioning this case, Tang Shaoyuan couldn't help but feel a little elated.

The family tree that Tang Shaoyuan mentioned was actually the genealogy of all the male members of a certain village that Lu Zheng had seen drawing on the first day he came to the provincial office.It was an old case that happened in Jingshan Township 11 years ago. The DNA fragment of a certain man was found on the victim. Unfortunately, all the men of the right age in the area did not match the samples.Later, this material was handed over to Tang Shaoyuan. He spent several months using Y-STR to determine the paternal inheritance characteristics of that DNA fragment, and finally locked on the Yao family in Andong Village, Pingqu County.This time I went to Pingqu because the criminal suspect 11 years ago had been arrested, and he needed to hand over some follow-up work.

"It's amazing." Lu Zheng also sighed sincerely: "The technology of criminal science is really changing with each passing day. Decades ago, who would have imagined that there is such a powerful tool for solving crimes as Y-STR."

Speaking of his professional field, Tang Shaoyuan is also full of professional pride: "That is, DNA is the well-deserved king of evidence."

"Oh?" Lu Zheng gave a smirk when he heard this: "Compared with fingerprints?"

"So we are now in a professional dispute between trace inspection and forensic medicine?" Tang Shaoyuan couldn't help laughing, and joked for the first time: "Fingerprints have many limitations. For example, the suspect wears gloves and burns the handprints." , Subsequent swabbing will affect fingerprint extraction. But DNA is different—the current DNA research has leapt from the trace stage to the trace stage. As long as the suspect has been to a place, he will definitely exchange substances with the outside world, even if it is Every bit of testing will leave him nowhere to hide."

"Yes, anyone who walks will leave traces." Lu Zheng suddenly became interested: "There are no two people who are exactly the same in the world. Fingerprints, palm prints, knuckle prints, and foot prints are all our marks." Even identical twins are not the same. But in terms of DNA, is there nothing you can do in this case?"

Tang Shaoyuan let out a chuckle, turned his head to look at Lu Zheng's eyes, his slender eyes showed seriousness: "Yes, there are no two identical people in the world. Even if they are identical twins, the DNA of two people The sequences are basically the same, but the individual RNA and protein expression profiles will still be different. Brother, if you have watched a famous American criminal investigation drama, there is also a point mentioned in it. Although the actual operability is not high, the idea is quite interesting. That's screening for antibodies that distinguish twins grown in different environments."

"Ha, don't be an ass." Lu Zheng's eyes lit up, and he caught the little braid in Tang Shaoyuan's words: "I'm not very good at biology, but I know a little bit about it. The materials are not stable, so they can only pass the fresh blood test."

"Indeed." Tang Shaoyuan smiled happily after hearing this, as if he still had some excitement about finding a confidant: "But even if we don't rely on these, there are ways to do it. Our current technology can't be tested, just because of traditional characteristics The point test method is not comprehensive enough, but if you really sequence the DNA of two identical twins, you will definitely find differences. Technology and knowledge are constantly evolving. As long as you want to do it, you will be able to do it one day arrive."

When he said this, his eyes sparkled, and suddenly Lu Zheng seemed to see Tang Shaoyuan standing on the three-point line again, who was skilled and almost Taoist.

Lu Zheng couldn't help feeling an inexplicable trust in the person in front of him, always feeling that what he said would definitely come true.

"Come on." He said in a low voice, raised his head and smiled, the deep dimple appeared on his face again, and his eyes were full of trust: "If it's you, it's definitely possible."

The two looked at each other and smiled. The late summer sun was warm and not dazzling, shining warmly on the body through the leaves, and the atmosphere was right for a while.

Suddenly a sharp and abrupt cry broke the tranquility of the campus.

"Help! It's on fire—!"