Miyun Public Security Bureau!
In the conference room!
The police officers were all shocked when they heard the report from the trace inspection:
"Did you find fingerprints?"
"After a leather jacket is burned, can fingerprints still be left on it?"
"Like plastic and metal, leather will leave 3D marks when exposed to high temperatures?"
…
The trace inspector shook his head directly:
"The principle of fingerprint residue on the surface of burned leather is different from that on metal and plastic.
Because the main components of leather are collagen and lipids, they will not react with the salt in fingerprints.
Under high temperatures, naturally no 3D imprints like the previous two will be left.
However, when leather clothes with fingerprints on them are exposed to high temperatures, carbonization will occur.
The moisture in the fingerprint evaporates, leaving behind white salt stains.
The carbonized layer of leather has obvious pores, and salt will be embedded in it.
If the carbonized part continues to be burned at high temperature, the carbonized layer will crack and peel off, causing the fingerprint to be destroyed.
But if the carbonized leather is no longer exposed to high temperatures, the salty fingerprints in it will be retained.
The fingerprints found by our Trace Examination Office are of this type.”
The police officers became even more excited after hearing the explanation from the trace examiner:
"In short, there are fingerprints left that appear to be the murderer's?"
"Fingerprints are key evidence!"
"The Trace Inspection Office has done a great job this time."
"Can you confirm that the fingerprints belong to the murderer?"
Listening to the excited discussion among the police officers, the young trace detective felt increasingly guilty:
"Everyone, don't be impatient, I haven't finished yet.
We did find salt residue in the form of fingerprints on the deceased's leather clothes.
Moreover, many fingerprints are on the back, where the probability of the wearer's own fingerprints remaining is relatively low.
Therefore, those fingerprints are most likely from the murderer.
However, there is no 100% guarantee that the fingerprints are from the murderer.
To be precise, the fingerprints could not be extracted.
Naturally, there is no way to identify it!"
Qian Duoduo frowned: "Why didn't you withdraw it?
Are you having difficulties?"
The trace examiner nodded: "It is very difficult to extract fingerprints from carbonized leather.
Our office does not have the technical conditions.
We contacted the top experts in fingerprint identification in China, and they also said that there are no successful cases of extracting fingerprints from carbonized leather internationally.
However, you can refer to fingerprint extraction on carbonized wood.
Vacuum metal deposition (VMD) is used to enhance the contrast of the carbonized surface and extract fingerprints.
However, this method is still immature, and the success rate in carbonizing wood is extremely low, less than 5%.
For carbonized leather, the probability of success will only be lower!
Moreover, after the experts reviewed the information we provided, they said that the carbonization of the leather was too severe.
To extract fingerprints, it is estimated that new technologies that are still in the experimental stage will need to be tried, such as laser-induced fluorescence technology (LIFT) or nanoparticle enhancement.
But the possibility of successful extraction is still very small.
After all, a good cook cannot cook without rice!
If the fingerprint itself is incomplete, no matter how advanced the technology is, it will be useless!"
"So, we can confirm that there are fingerprints on the carbonized leather, but we can't extract them?"
Qian Duoduo frowned:
"This is a bit troublesome."
Shen Ting, who was sitting next to him, heard the carbonized leather picture shown by the trace inspection. His reaction was exactly the opposite of Qian Duoduo's, and his eyes lit up.
When Shen Ting looked up "fingerprint analysis" because of the broken fingerprints on the surface of bomb fragments, he found that there was a method for extracting fingerprints from the surface of carbonized materials.
Moreover, looking at the carbonization state of the leather jacket, although it is very serious, the chances of successfully extracting fingerprints are still very high.
Qian Duoduo noticed the change in Shen Ting's expression, looked at him with anticipation and some disbelief, and asked:
“Chen Ting, judging from your appearance, is there a way to extract fingerprints from the surface of the leather jacket?
Or, do you have other ideas for investigation?"
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