Not only do those substances decay themselves, but they are also constantly soaked in pond water and contaminated by pollutants in the pond.

Even if the physical evidence involved in the case is found, it will be more difficult to complete the identification and reach a conclusion.

"Leaving aside the miscellaneous physical evidence, there are three types of physical evidence that could hopefully 'describe' the murderer's movements.

Mud and sand!

Pollen!

And the remains of insects!"

The mud and sediment should be removed first.

Because he tried it at the beginning using forensic geology.

All we can confirm is that the criminals' general area of ​​activity was in the southern part of Chaoyang.

"Insect remains, can you try?"

When a car is driving, insects will enter the interior of the car through exhaust, heat dissipation and other equipment.

Most of them will be killed or even smashed to pieces!

The distribution areas of insects also follow certain patterns.

By using specific insects, the car's driving path can be restored.

There have been many successful cases in criminal investigations.

Shen Ting opened the detective group and looked at the skills column on the group owner’s private panel.

Find the skill called "Insect Detective".

He didn't redeem it directly, but read the introduction of the skills first...

"I'm afraid not!"

Shen Ting quickly shook his head.

Insect detection has even greater limitations in determining trajectories than forensic geology.

Because of geological minerals, the location is basically fixed.

The distribution area of ​​insects covers a large area, and the boundaries are not only vague but also not fixed.

After all, insects are mobile.

Take the suspicious area in southern Chaoyang in this case as an example, which was circled by the investigation team at that time.

It is impossible to say that an insect is distributed in the eastern part of this area but not in the western part.

This is unreasonable and does not conform to the characteristics of insects!

"All that's left are the pollen..."