Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Everyone knows that there must be a difference, otherwise Lu Chuan would not have taken it out, but they really can't tell the difference, and it feels similar to other photos.

"There are differences. The center of gravity in these photos is very different from some other footprints. The center of gravity is biased toward the front and back, with lighter force on the heel, and heavier force on the front toes."

I knew that there hasn't been much research on footprint identification and analysis, so I didn't keep you in suspense and went on to explain some of the reasons for this situation.

"Generally speaking, only people who wear high heels for a long time will develop such a habit."

"High heel?"

"Yes, it's high heels. For people who wear high heels for a long time, the center of gravity under their feet is slightly different from that of ordinary people who have never worn high heels. And you can try it yourself. For ordinary adult men, the ability to exert force on the forefoot is relatively weak."

"Only those who wear high heels for a long time or practice ballet or other dances will have the ability to support the center of gravity of the whole body with the forefoot alone."

This is Lu Chuan's judgment on the murderer's possible behavioral habits based on the footprints, or in other words, his professional judgment.

In fact, from the perspective of probability, when it comes to identifying and analyzing footprints, there are still significant differences between male and female footprints.

Generally speaking, the size of men's footprints is concentrated above 40 yards, and 44 to 45 yards is a relatively concentrated range.

In this range, sizes 42 to 43 are relatively more concentrated.

Women's footprint sizes are mostly between 36 and 40.

Among them, numbers 38 and 39 are relatively concentrated.

In addition, there are differences in gait between male and female footprints, and there are certain regular differences in stride length and footsteps.

However, this is only a regular understanding.

Some men are born with feminine features, and some women are born with masculine features.

Therefore, footprint identification can only assist in determining gender, but cannot be used as a decisive factor.

However, judging from the on-site investigation, it is slightly more likely that the murderer is a female.

However, what Lu Chuan said seemed to confirm why the murderer was poisoned to death.

The deceased was an adult male. If the murderer was a female, the possibility of causing the other party's death through fighting or other means would be low. However, if the other party poisoned the other party, the possibility of causing the other party's death would be very high.

"In addition, I found a set of wheel and tire marks in the yard of the abandoned logistics park where the crime occurred."

After reporting the relevant situation of the footprints on the road, he began to report the investigation of the tire marks in the yard.

"First, tell me the brand of the tire."

Lu Chuan flipped the projection and four sets of photos appeared.

"All four tires are Continental silent tires. This type of tire is rarely used on new vehicles. I checked and found that only four BMW sedans from three years ago used this type of tire."

Then Lu Chuan projected the relevant car brands in front of everyone.

Then he added: "Compared with the tire marks of the other three tires, the wear of this tire mark on the right front wheel is much smaller, basically about one-fifth of the wear of the other tire marks."

"Although the sales cycle of these cars is relatively long, the only ones that use this type of tire are from the production batch three years ago." "The cars produced later do not use Continental's silent tires, so the car driven by the murderer should have been purchased three years ago."

Compared with the clues found on the footprints, Lu Chuan actually felt that the clues he found on the tires were more worthwhile. It would be easier to track down if the front-end criminal police paid attention to this clue.

Lu Chuan then analyzed: "Based on the mileage of tire wear, the mileage of this car should be between 3 and 4 kilometers."

However, the scratches on different tires with different mileages are still quite obvious. When Lu Chuan analyzes the tire marks, he can usually make a relatively accurate judgment.

"The wear marks on the right front tire are only about 1/5 of those on the other three tires, which means that this tire should have been replaced later."

"If it was replaced after a tire, there is only one possibility. This tire had a flat tire before, so they had no choice but to replace it with a new tire. Based on the difference in mileage and wear of the vehicle, plus the time when the car was purchased, it can be judged that the tire was replaced in May or June of this year."

Lu Chuan continued to report: "Of course, the premise for making this judgment is that the mileage of the vehicle is relatively even. Of course, it is not ruled out that the vehicle has not been driven this year, but the mileage was relatively high last year. In this case, it is also possible that the situation I mentioned may occur."

Probability.

The limited investigation and analysis that Lu Chuan is currently doing is only based on some traces at the scene, and some data-based, empirical and technical judgments. He has not been to the scene to see these things in person, so all analysis is probabilistic.

The person on the side of the road was reporting, and the others were listening very carefully and observing some information on Lu Chuan's PPT.

It can be said that some analysis of vehicle tire marks made everyone feel very excited.

The reasons are as follows.

The first is the specificity of this tire, which can lock the model to a certain year, so it is convenient for everyone to investigate the vehicles of a certain year. Although the number of sold is not small, if it is concentrated in Haizhou City, there may not be so many.

The second is that the right front wheel of this car had a flat tire.

In this case, if we just check the sales records of Continental tires in Haizhou City in the past year, not to mention May and June, we should be able to find some clues.

The third is that now that the brand of the vehicle has been determined, we can conduct some investigations through the surveillance of the roads around the scrap logistics park and find all the videos of the relevant vehicles, and then we may find some clues.

Compared to people, investigating vehicles is much easier because vehicles are larger in size and have license plate numbers.

"Very good, Lu Chuan, do you have anything else to say?"

Li Donglin was very pleased that Lu Chuan had achieved so much in just one night and discovered so many clues.

"Director Li, there is no more for now."

"Okay, Wang Song, how's the situation on your side?"

Li Donglin turned his head and looked at the others.

Wang Song is responsible for investigating the identity of the deceased.

"We have some clues." Wang Song stood up and took the projector operating pen. "Just two hours ago, Lu Chuan sent us the DNA information of the deceased. We compared it with the missing persons in the whole province."

"Finally, a discovery has been made." (End of this chapter)