Animal blood will also cause the luminol reagent to react.
Jiang Daoqing smiled and said, "It's definitely human blood.
We used immunochromatographic test strips.
The test came back positive!"
A positive result means that human components were detected in the blood, indicating that the blood belongs to humans.
A long time ago, blood typing test strips were used to detect whether the blood at the scene belonged to humans.
The principle is antigen-antibody reaction.
If a person's blood cells have the A antigen, they have type A blood.
It will combine with the antibodies in the corresponding antibody area on the test paper, produce agglutination, and show a positive result.
The red blood cells of common animals such as cats, dogs, cows, and sheep do not have A and B antigens with similar structures to humans.
They have their own blood group system.
Therefore, animal blood will not cause human ABO blood type test paper to react.
But this method is not direct enough.
Immunochromatographic test strips were also produced using the principle of antigen-antibody reaction.
When blood dripped onto it, two lines appeared, indicating it was positive, which meant it most likely belonged to a human.
One line indicates animal blood or severely degraded human blood.
More intuitive!
Inside the cold storage!
Jiang Daoqing asked his colleagues to turn on the lights and continued:
“This table is probably where the cloaked figure disposed of the missing bodies of the thirteen victims.
Besides the blood, we found something else.”
Jiang Daoqing asked his colleagues to show Shen Ting some powder:
“These were also found in the cracks of the table.
It may be related to the case.
I guess it has something to do with how the cloaked man deals with those bodies.
However, the specific nature of these powders has not yet been determined and they need to be taken back to the bureau for further identification.
Other discoveries include some fibers, hairs, etc.
Further identification is needed to confirm where they come from.
Besides these, the most crucial discovery in this vegetable store this time is actually this!"
Jiang Daoqing pointed to a corner of the cold storage, where he saw a police officer taking pictures of a clay sculpture on the ground...
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