Chapter 37 Evidence collection
Mu Zhiyang also lay down and looked at the fingerprints carefully. Google search reading
The incomplete fingerprints are mainly located at the fingertips. The middle part is not pressed very comprehensively, and the total area is not large.
"Is it too long?" Mu Zhiyang was a little disappointed. The brush cost more than 200 yuan, but it used expensive copper powder, but it didn't produce complete fingerprints.
Jiang Yuan first took out the camera and took a photo as clear as possible. Then he straightened up and looked directly at the captured fingerprint pattern. He said slowly: "It's a bit incomplete, but I should be able to piece together a dozen features." point."
Mu Zhiyang stood on tiptoe and looked at the fingerprints, and said in surprise: "The shape is not complete, and the lines are blurry. Can you still come up with a dozen characteristic points?"
"You should look at the fingerprints from the arson case I made a few days ago." Jiang Yuan leaned over and took a few more fingerprint photos, and then started taking photos of the scene.
Mu Zhiyang slapped his head: "You said that my association ability... well, that's you. If someone else came over, this case would be really difficult to solve."
If the same fingerprints were taken out by the county bureau on-site inspection, the trace inspection would definitely have to pretend to be dismissive. Otherwise, what should I do? With such a dog-like appearance, no matter whether it is Lao Yan or Xiao Wang, there is no match for him.
Even if the fingerprints were more complete, the two of them probably wouldn't be willing to do it.
Complete fingerprints can be matched with your hands, but the more incomplete the fingerprints, the more disturbing they are. If the fingerprints are incomplete to the extent of an arson case, it will not only be disturbing, but it may also waste your energy, and it will take an expert. The effort of level mark inspection...
If a case was solved using this method of burning brain cells, if only a few electric vehicles were stolen, the police officers handling the case would feel embarrassed.
Jiang Yuan did it by himself, so he didn't have so many long words. He said politely: "I only know fingerprints. If the police station checks, there should be other ways."
"Even if there is a way, it may not be possible to solve the problem. Many of the thefts of electric vehicles are committed on the fly. They stay in one place for a period of time. After spending all the money, they feel it is dangerous, and then go to another place. It is like traveling. ." Mu Zhiyang felt a little envious for no reason.
Zhou Ta happened to come back after finishing the on-site notes. Hearing the second half of Mu Zhiyang's sentence, he agreed: "It is indeed true. Some people also know that rabbits do not eat grass near their nests."
"I'll compare the fingerprints as soon as possible." That's all Jiang Yuan could do. If it is delayed for a long time, even if the fingerprints are compared, it will still be a problem if the suspect escapes - this is another trouble in reality. Even if you know where the suspect is, the procedures for handling the case in a different place, the time and energy spent, and With burning funds, it's all trouble.
Imagine two police officers, probably four police officers, driving to another city, perhaps thousands of kilometers away, to communicate with the local criminal investigation department and request someone to assist in the investigation and arrest of the criminal suspect. In the process, they have to pay for gas and tolls. , spend a lot of money on overtime and room and board, but what you bring home is a petty thief who stole several electric cars, and there is a possibility that no one will be caught... Whoever thinks about it will feel panicked. .
Compared with the young Mu Zhiyang, Zhou Ta was even more unable to understand Jiang Yuan.
However, he was used to doing more and talking less. He helped Jiang Yuan organize things and rushed to the parking area outside the community without stopping.
When they arrived at the place, the three of them each put on gloves and masks and began to dig through the sewer, trying to find the cigarette butts and garbage seen in the video.
Three people and two big bags quickly stood up with satisfaction.
"With pollution like this, cigarette butts are probably the only ones that can be used." Jiang Yuan sighed. There were a lot of cigarette butts in the sewer, so he took them all out and collected them one by one in small evidence bags.
Jiang Yuan did this action for more than a quarter of an hour.
Mu Zhiyang looked tired, took off his gloves, covered his nose and let go in disgust, saying: "The garbage water has been soaked in, how can we still check the DNA?"
"It should be no problem. Cigarette butts have a strong ability to preserve DNA." Jiang Yuan carefully observed the cigarette butts and said, "As long as they are not moldy, DNA can be detected from 10-year-old cigarette butts."
"So powerful? Why? Did it get soaked in when you sucked it?" Mu Zhiyang followed his master to solve cases all day long, but he didn't pay attention to this.
Jiang Yuan nodded and said: "On the one hand, it takes a long time to smoke, and on the other hand, the structure of the cigarette butt is good and can resist external erosion. When the DNA is tested, it will be easier to tear out the cotton inside strips. come out."
"So we always say in the police station that you need to learn how to commit crimes. You said, in this day and age, there are still people who throw cigarette butts at crime scenes. We usually work on cases too, everyone is stupid, and there is evidence everywhere... "Zhou Ta shook his head with a smile.
Compared to Zhou Ta, the veteran auxiliary police officer, Mu Zhiyang saw things more clearly and said, "They don't want to keep evidence, they just don't care. I once followed my master to investigate a murder case and encountered it once. The murderer killed someone. , ran out of the alley, with blood still in his hands, smoked, and threw the cigarette butt in front of him after smoking. It’s not that they didn’t know, but they couldn’t think of this at the time. They were too nervous.”
"That makes sense. On the contrary, it's easy to do a theft case, your thinking is quick, and it's hard to find evidence." Zhou Ta said.
"Those who engage in theft have to repeat it many times and have a high level of proficiency. Generally, those who engage in murder are done with it after one or two attempts and have no chance to practice." Mu Zhiyang began to summarize.
"Murder is also complicated. The scene is often messy and there are corpses... It is equivalent to a big project. What was stolen is a small project. People who start working on big projects are definitely prone to making mistakes." Zhou Ta also summed up some experience.
Jiang Yuanyang opened the evidence bag and said, "I don't know if I can compare the DNA when I go back."
"Just do your best and obey fate, that's what it is." Zhou Ta followed him for such a long time, hoping that there would be results. It's just that he is more sensitive to the experience of failure than to success.
Jiang Yuan only nodded slightly. Speaking of which, this was the first time he had run a complete case.