When they investigate a crime scene, they often use a reagent called luminol, which can detect bloodstains in a dim environment and produces a blue light reaction.
However, these reagents also have limitations.
Sometimes, criminals with high IQ will use bleach to clean the scene, interfering with the subsequent investigation work of the criminal police.
"The chemical reagent developed by Boss Cheng and his team can not only be used in bright light, but as long as we wear the matching glasses, we can clearly distinguish the depth of these bloodstains."
Li Zhen walked to the bed and pointed at the light spot with his gloved finger.
"Look, from deepest to shallowest, there are six in total. The deeper the bloodstains, the more recently they've been there. The shallower ones were left a long time ago."
Li Zhen shook his head excitedly. "Boss Cheng and the others are truly talented. With their abilities, they're still pursuing medical device research. They really should join the nation and contribute to our public security cause!"
Shen Sili was not interested in what Li Zhen said. He was more concerned about the clues of the case itself.
He walked to the bed and studied the bloodstains on the bed with Rosen.
Song Jingcheng called Li Zhen aside and took the opportunity to have a serious chat with him about cooperation.
He told Li Zhen: "Boss Cheng is the head of the R&D department of Sumen Medical, and Sumen Medical is a medical company founded by my wife."
"The anti-wolf spray that's popular in China right now is made by them. Officer Li, if you're interested, Sumen Medical can also cooperate with the government..."
Being able to cooperate with the country is a win-win situation for Sumen Medical. Song Jingcheng must seize the opportunity to contribute to his wife's career.
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