"This is the erudite Mr. Wang. Just by looking at his glasses, you can tell he has profound knowledge."
Mr. Wang smiled and said, "Mr. Li, you’re flattering me as soon as we meet. It’s making me a bit anxious."
As he spoke, his gaze fixed on the evidence bag in Wan’s hand.
"Mr. Wang, you don’t need to worry. This is certainly within your area of expertise, and it’s also your specialty."
Li Jian introduced, "We have a case where a steel rod was found at the scene with a greasy substance attached to one end. We’d like you to identify what type of grease it is."
After hearing this, Mr. Wang nodded and said, "Haha, this is indeed my specialty!"
"Let’s go! We’ll chat while working in the lab."
Immediately, the three of them followed Mr. Wang into the laboratory building.
With the assistance of his aide, Mr. Wang quickly wiped, extracted, and transferred the greasy substance from the steel rod.
After shaking in a test tube, it was finally placed into an instrument for testing.
Next, he took off his gloves and went to the waiting area in the lab.
"Mr. Li, we’ll get the results in 10 minutes."
Li Jian was somewhat surprised.
He recalled, "I remember sending an item for you to identify five years ago, and it took almost 3 hours."
"This time it only takes 10 minutes?"
"Technology has advanced rapidly. A 10-minute instrument analysis and 30-minute preliminary preparations are just medium-level now."
"If we use the most advanced instruments, both steps together wouldn’t take more than 20 minutes."
As the four conversed, a "beep beep beep" sound suddenly came from the ear.
Mr. Wang turned to glance at the glass showcase.
"Let’s go in and see the experimental results."
Immediately, the four walked into the laboratory together.
The assistant moved the mouse, opened the graph, and clicked print.
"Master, according to the peak analysis and comparison of this grease component, it should be regular cooking rapeseed oil."
Mr. Wang took the graph and looked at it.
He nodded and said, "That’s correct. This is the rapeseed oil we commonly use at home for cooking."
Li Jian and Wan were both a bit surprised.
However, Jiang An fell into deep thought.
Why would rapeseed oil be on this steel rod?
Suddenly, Jiang An recalled the dagger found at the construction site, which seemed to have a small amount of grease on its handle as well.
Could it be that the handle also had rapeseed oil?
After a moment, Li Jian said, "Mr. Wang, thank you for your tremendous help."
Mr. Wang smiled. "Thank you for bringing me the identification task."
Immediately, the three of them waved goodbye to Mr. Wang.
They got into the police car.
Li Jian suddenly said, "Since the suspect’s hands have rapeseed oil, it means he came into contact with rapeseed oil shortly before committing the crime."
Wan, holding the steering wheel, said, "According to our everyday knowledge, situations where one can come into contact with rapeseed oil either involve cooking or selling rapeseed oil."
"Or even getting oil stains during meals, like gnawing on chicken feet or duck necks."
Li Jian nodded, "Indeed, those three possibilities exist."
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Jiang An sat in the back seat, furrowing his eyebrows.
Initially, based on his judgment, the murderer must have been prepared in advance.
But why was there rapeseed oil on his hands?
Could it be a personal occupational characteristic of the murderer?
Or did the murderer suddenly see the victim Liu Jun and had no time to clean the grease on his hands before initiating the murder plan?