Like a little cheetah that had caught its prey, Ling Yi quickly walked over and picked up his sneakers, the soles of which were stained with some mud.

"Did it rain yesterday evening?" Although she slept all night, she went out in the morning to find that the soil was a little wetter than usual.

"Well, thundershowers."

"I remember the nightclub people mentioned that Ruan Ling has been running before going to work all these years, she usually comes to work at 10 o'clock, so her running time is probably between 8 and 9 o'clock. It had rained that evening, and the ground was a little wet, so the soles of her shoes were covered with so much mud. ”

Yan Chen's eyes were certain. "People usually start to stiffen within 30 minutes to 2 hours after death, and the whole body stiffens after 9 to 12 hours, and if the ambient temperature is higher than 35 degrees, the stiffness and softening will accelerate. There is also a situation that will accelerate ......"

"Strenuous exercise before you die." Ling Yi was a little excited, "After strenuous exercise before death, the protein is easier to coagulate in the body, and it will stiffen faster after death. ”

"So it doesn't take 9 to 12 hours for a corpse, and Ruan Ling's murder time should be pushed back about two hours, which is 11 o'clock."

"Sister Jiao didn't have alibi at that time!"

This momentous discovery thrilled the two.

"Assuming that the murderer is Sister Jiao, then the shoe prints in the room are not all Sister Ruan's."

"Hmm."

The two searched separately.

The shoe prints left by the offender at the scene can not only provide evidence, but also depict the individual physiological characteristics of the offender, including age, height, posture, gender, etc.

"There's a footprint here." Ling Yi shouted.

There is a very shallow patterned footprint next to the shoe rack.

"Everyone's foot length and head length are basically the same, so the ratio of height to length is basically 7:1, but it will also be affected by the region, Sister Jiao is a local, and her height is foot length multiplied by a coefficient of 6.75, so it is about one meter seven, which is consistent with her height, and Sister Ruan is only one meter six, which is not her footprint."

This is undoubtedly a major breakthrough!

At this time, Ling Yi's mobile phone rang.

"Sister Jiao's biological mother has been found."

……

Two hours later.

Ling Yi pushed open the door of the interrogation room.

"It seems that evidence has been found, and hopefully useful evidence." Sister Jiao is still beautiful and moving, smiling at her, without the slightest nervousness of being listed as a suspect.

"You stayed home last night and didn't go out?" Ling Yi sat down.

"Nope." Sister Jiao's eyelashes fluttered.

She's lying.

"Then why did you find your footprints at Ruan Ling's house?"

"Is there one? I'd like to know that too. ”

Ling Yi pushed over a photo. "These are footprints found at Ruan Ling's house, exactly the same as the underprint of this shoe on your foot."

Sister Jiao smiled. "Officer Ling, you want to deceive me? Or do you not hesitate to perjury in order to make me confess a sin that I have not committed? ”

"You're so sure the footprints aren't yours?"

"It's not."

"How do you know it's not?"

Sister Jiao was a little nervous under her strong questioning, and changed her words: "Even if it is, what? I've been to her house before and it's normal to have my footprints there. ”

"But the part-time worker just cleaned up in the afternoon, and it was very clean. And this footprint was at the door, the soles of her shoes were stained with mud in the rain, and the footprints were obvious, she couldn't have not noticed. ”

"If that's the case, then it's even more unlikely that you'll leave my footprints, and you're cheating."

"Are you so sure?" Ling Yi quickly asked, not giving the other party a chance to breathe, his eyebrows were cold and compelling. "Why are you so sure?"

"Because I've wiped it off." Sister Jiao shouted with some eagerness.