Han Xiaomei hid outside the corridor and looked around sneakily. Finally, when no one was paying attention, she bent down and sneaked into the Trace Inspection Department.
A few minutes later, with her shoulder bag and her hands in her coat pockets, she limped out of the Public Security Bureau with her head held high.
The hour hand was close to 12 o 'clock. Yan Ji, who was sitting in the living room, suddenly raised his head. The next second, the doorbell rang.
"I was scared to death. When I came out, I bumped into Director Gou working overtime. He asked me why I went to the Trace Inspection Department in the middle of the night. I could only say that I forgot to register the inspection box that I brought yesterday, so I secretly came to register it at night!" Han Xiaomei took out a few bottles and spray bottles from her bag one by one. She wanted to cry but had no tears. "Director Gou also scolded me. What if he told Yu Dui tomorrow? My great career has just begun and I'm going to be stained! "
Yan Ji didn't say a word. He went to the kitchen to get half a cup of distilled water. When he came back, he put on the trace inspection gloves and mixed the luminol and potassium hydroxide powder with the water. He poured it into the spray bottle filled with hydrogen peroxide.
"Yan Ge, what are you doing?" Han Xiaomei finally felt scared. She whispered, "You … you cut your wrist at home and spilled blood on the floor?"
"…"
Yan Ji looked at her up and down. He went to the bathroom door and took a breath.
Han Xiaomei followed behind quietly. She saw Yan Ji take the spray bottle and spray it on the floor, the corner, and the sink. He then went out of the bathroom and turned off the light.
"Phew —" Han Xiaomei covered her mouth.
In the dark, the sink was dotted with stars. A palm-sized faint blue-green light slowly lit up on the floor. It was a blood reaction!
"Do you know what's going on?" Yan Ji asked.
"I, I, I didn't see anything. I don't know anything!" Han Xiaomei covered her eyes with both hands. "Captain Yan, Yan Ge, Moneyman Yan! I beg you, I promise I won't say anything when I get out! "
"You should have learned from your police academy textbooks that luminol solution is catalyzed by iron ions in the blood and emits a blue light after oxidation. That's why it's used to detect blood at crime scenes. However, if there are other strong oxidizing agents present at the scene, luminol will also emit light. Therefore, if hypochlorous acid bleach or feces is used to smear the scene, the strong fluorescence will interfere with the criminal investigators' judgment of the blood. "
"I, I, I, we've memorized it before," Han Xiaomei stammered. "The fluorescence produced by hypochlorous acid turns on very quickly, but the fluorescence produced by blood iron ions turns on very slowly. We can distinguish it by taking pictures and exposing it to light up..."
"But what about when criminal cameras weren't popular back then?" Yan Ji asked.
Han Xiaomei's brain was working hard, but Deputy Yan's cold and powerful aura made her stumble.
"It's actually very simple." Yan Ji smiled coldly and said slowly, "As long as we seal the scene and keep it dry, the oxidizing agent will evaporate when we test it again in a few days. However, the iron ions will not disappear for a long time and will still make Luminol glow even after a few years."
Han Xiaomei was speechless. "Oh —"
"I've been gone for three weeks. No matter how much bleach was used that day, it should have evaporated completely when the scene was completely dry. In other words, the fluorescence isn't hypochlorous acid, but blood. "
The fluorescence was very weak. On one hand, it had been washed by bleach. On the other hand, it was also because the amount of blood was not much and was washed away by water, causing the area of blood to be very spread. Han Xiaomei's mind was in a knot and she asked subconsciously, "Whose blood is it?"
As soon as the words left her mouth, she wanted to bite off her own tongue.
"Who else could it be?" Yan Ji looked at the fluorescent shapes on the ground and the countertop and said eerily, "Of course it's that bastard surnamed Lu."
Han Xiaomei: "..."
·
In the evening.
The Hongqi sedan stopped in front of the building. Director Lu got out of the car and politely declined the driver's offer to help him carry his bag upstairs. He staggered into the corridor alone.
Then he turned the corner and immediately straightened his back. His steps were light and agile as he strode into the elevator.
"I'm back!" Director Lu opened the door with a clatter of keys and shouted loudly. He put the leather bag under his armpit on the porch and lowered his head to take off his shoes. The sizzling sound of his wife cooking came from the kitchen. He turned around and loosened his shoulders in satisfaction. Then his movements paused in mid-air.
Yan Ji sat in the middle of the sofa in the living room and looked at him expressionlessly.
"This child, it's fine if he came, but he still brought gifts." His wife came out of the kitchen with a red and glossy mushroom braised egg and braised pork. She said with a smile, "It's not the New Year or a festival, but he still brought skincare products to an old woman like me. I say, why would I apply that? Look at how my old face is ruined. It's a waste to apply it …"
His wife happily went back to the stove to cook eggs and enoki mushrooms. Only Director Lu and Yan Ji were left in the large space, one standing and one sitting, facing each other.
"That year, the Jiang Stops visited Yue Guangping without authorization. Only half a year later, Yue Guangping died, and the Jiang Stops was also finished." Director Lu finally sighed and murmured, "The country should really make a rule to prohibit the captain from visiting the Public Security Bureau Director's house. This is really a bad omen …"
Dong!
A glass full of chrysanthemum wolfberry tea with rock sugar was placed on the desk by Director Lv. Then, with a "heya" sound, he stuffed his big butt into the swivel chair. He put on his reading glasses and asked, "What exactly do you want? Let me say it in advance. You are still in the period of suspension and investigation. You are not allowed to spy on any daily affairs of the Municipal Bureau and information related to the case. Otherwise, you will be dealt with as a violation of discipline. "
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