Chapter 429: Doing a favor by the way
Song Tiejun’s case is finally over.
For the subsequent case handling, the serious crime team was directly handed over to the Tianzhou Municipal Public Security Bureau.
Of course, no one knows whether Song Tiejun really only killed five people.
No one can say clearly whether Wangjiahe was the only place where Song Tiejun dumped his body.
After all, even for the five corpses that have been found, from the perspective of traces found, there are no direct traces of Song Tiejun on the corpses.
However, the basis for domestic conviction does not require actual evidence. Logical reasoning can still be adopted.
If the suspect cannot prove his innocence to a certain extent, it can only mean that you killed the person.
Of course, there is no direct evidence, such as the blood stains on the walls of the wing of Song Tiejun's house, the saws and axes used to dismember the corpse, and the stove used to burn the head.
These can indeed kill people.
However, with current criminal investigation technology, it is impossible to clearly determine who they are.
"Teacher Lu, thank you for your trouble in our case last time."
Wang Chuanmin, the captain of the Tianzhou City Criminal Investigation Detachment, has not been idle these two days. They have been solving another case. A murder case.
This is why Wang Chuanmin reported the case to the provincial department as soon as possible after the case was reported. They were really overwhelmed.
Furthermore, the case was so difficult that Wang Chuanmin was not completely sure of solving it, so reporting it to the provincial department was the only way.
Although the case has been solved now, judging from the process of solving the case, there was a certain amount of luck.
If Sun Jianguo and Zhang Erhe had not gone to the old street, or if they had gone to the old street, they would not have had mutton soup at Song Tiejun's house.
Or maybe he drank the mutton soup but didn’t talk to Song Tiejun about the past.
Then it is really possible for Song Tiejun to escape.
At that time, if there were no new clues to solve the case, it would be extremely difficult.
Lu Chuan has been to Tianzhou City several times and is familiar with Wang Chuanmin, the detachment leader here.
"Captain Wang is too polite. The last case was just a coincidence and didn't help much."
The Tianzhou City Skeleton Case was an important battle that made Lu Chuan famous. .
It was precisely because of his involvement in the Tianzhou City Skeleton Case that Lu Chuan came into the sight of the provincial department.
This gave me the experience of participating in many major provincial and departmental cases.
"Teacher Lu, you are done with the case here. When are you going to go back?"
"I will send a car to take you back."
"Tomorrow, the crime team Nothing happens. I’m going back to Haizhou City tomorrow.”
“There’s no need for a train. I can go back quickly by train.”
Haizhou City and Tianzhou City are not far away. , it is not necessary to take a train to fly.
"Hey, how can that be done? If Lao Qin knew about it, he wouldn't blame me for not fulfilling my duty as a landlord."
"I have been busy with a murder case recently. Otherwise, I must ask Teacher Lu to take care of me." Have a drink!”
Be obedient, Lu Chuan is no longer the stupid young man he was more than a year ago.
"Captain Wang, I don’t know if there is anything I can do to help with your current case. If you need any help, please don’t be polite. When I came, Captain Qin specifically explained that Tianzhou City Criminal Investigation Detachment We are neighbors with the Haizhou City Criminal Investigation Detachment and we cooperate closely. Let me learn more from you.”
“Haha!”
Wang Chuanmin laughed, who could not like someone like Lu Chuan? .
Be capable, not arrogant, and speak well.
"Teacher Lu, with your words, I feel relieved. Not to mention, the current case is really difficult. If you have time, can you help me?"
"Time It will be no problem when the time comes, but Captain Wang, you also know that I am the current surveyor, and others may not be able to help.”
“Also, Captain Wang, just call me Xiao Lu, Teacher Lu. I really don’t dare to take it seriously.” “Haha, okay, I won’t be polite. It is indeed a clue from the current investigation.”
There was no politeness in solving the case. Lu Chuan followed Wang Chuanmin directly to his office.
"This is the dossier, Xiao Lu, take a look at it first."
The dossier is not thick, only six pages.
The case is not particularly complicated.
A week ago, the Tianzhou City Beijiao Police Station received a report that a murder occurred in the Beijiao Logistics Warehouse.
The patrolling security guard at the logistics base discovered a body in an abandoned warehouse.
“The scene was clean and tidy. The murderer even used a broom to clean up his footprints. No traces were left.”
“And the other party left the murder weapon inside the body of the deceased. We are on the handle of the murder weapon. Some clues were extracted. "
The photo in the file shows a sharp bone-picking knife with vague fingerprint-like traces on the handle.
"Xiao Lu, look at this trace...can you do some identification and analysis?"
Wang Chuanmin was actually a little embarrassed.
Fingerprint identification requires fingerprints.
But...even a novice knows the thing on the handle of the knife, and it has nothing to do with fingerprints.
On the second day after the incident, Wang Chuanmin actually contacted the provincial department. The fingerprint expert there had already looked at it and the answer was only three words.
joke.
Lu Chuan frowned, this thing...
"Captain Wang, is it easy to see the murder weapon?"
This level of "fingerprints" can be seen with just a photo and even a thread. Not coming out.
"That's no problem. The murder weapon is in the evidence room. I'll send someone to get it now."
Ten minutes later.
The murder weapon has been in Lu Chuan's hands.
Lu Chuan looked carefully and made a judgment.
The blurred marks on the knife handle are indeed traces left by fingerprints, but they are not direct traces left by fingerprints.
The murderer was indeed very cautious. He not only cleaned his footprints when leaving the scene, but also disguised his fingerprints when committing the murder.
The murderer was obviously very confident in his disguise, so even though there were vague marks on the handle of the murder weapon, he did not continue to clean it.
"Team Wang, this identification analysis...is a little difficult."
"And the method used by the murderer...is not as simple as wearing gloves."
Oh?
Wang Chuanmin only has a general understanding of fingerprint identification, not in depth.
Lu Chuan continued to explain: "When the vast majority of murderers commit crimes, in order not to leave fingerprints, they will wear gloves to commit crimes."
"The most effective way to prevent fingerprints from leaving behind is to wear cotton gloves, but cotton gloves are more It is thick and has poor friction. It is not easy for the murderer to control the strength of his hands when committing the crime."
"In addition, some murderers wear surgical rubber gloves, but these gloves are also very thin. It is possible that the murderer's fingerprints will be vaguely imprinted on the murder weapon. "
"Of course, the murderer's fingerprints can also be extracted from the inside of these rubber gloves."
"In addition to wearing gloves. In addition, there are many ways to make fingerprints disappear. ”
"For example, applying glue on fingerprints can cover up fingerprint information, or soaking fingerprints with high-concentration radon sodium oxide can also remove fingerprints. Soaking them in dilute nitric acid can peel the fingers, and fingerprints will disappear within a certain period of time."< br>
“In addition to the above methods, burning with cigarette butts, rubbing fingerprints mechanically, etc. can make fingerprints disappear in a short period of time.”
(End of this chapter)
< br>