Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Although the High-tech Zone Criminal Police Brigade has conducted multiple investigations on the crime scene, and Yuan Shaopeng has presented some relevant materials in his report yesterday, all the on-site investigations conducted by the High-tech Zone Criminal Police Brigade and the information currently discovered have been handed over to the Criminal Investigation Detachment.

There is actually some relatively complete information about the house where Li Xiaomin disappeared, but after Yang Lin and Yang Sen, the two criminal police from the Criminal Investigation Detachment, received the case and conducted an on-site investigation, they decided to survey the entire scene again.

Not to mention that the level of the two people is definitely higher than that of the on-site investigation criminal police in the high-tech zone, the key is that the Criminal Investigation Detachment has a lot of equipment that the Criminal Police Brigade below does not have, so it is very likely that these advanced instruments will be used to find some clues. Even if these clues or clues cannot form effective directional clues, they can also provide a certain basis for Lu Chuan and others to make judgments.

"The investigation report of the High-tech Zone Brigade said that the bloodstains were concentrated beside the bed." Yang Sen squatted down and picked up a short black hair from the gap between the floor tiles with tweezers, "But they ignored this-" He put the hair into the evidence bag, "This hair is entangled in the gap between the screws at the foot of the bed, and there is a hair follicle at the root, which is more valuable for detection than the male bloodstains found before." Yang Lin held up a multi-band light source, and the tiny bloodstains that were originally difficult to distinguish with the naked eye appeared under the purple light, like scattered stars in the night sky, winding into a thin line along the corner of the wall.

"Look at the angle of the splash." Yang Lin marked the wall with a laser pen, and the red light spot moved with his movements. "The measurement error in the high-tech zone is at least 5 degrees. According to the correct angle, the victim should have been in a half-kneeling position when he was attacked, not standing." His voice echoed in the empty room, in sharp contrast to the conclusion of "standing fight" in the previous report. Yang Sen took out a D scanner and completely modeled the entire bloodstain area. The data on the screen kept jumping, and the bloodstain shapes accurate to millimeters were restored one by one.

In the bathroom, Yang Sen turned on the ultraviolet light, and suddenly a large area of ​​fluorescent reaction appeared in the gaps between the floor tiles. "They only tested the drain." He carefully extracted the sample with a cotton swab, "These fluorescent substances are chloro-meta-xylenol, which is commonly found in strong detergents. The murderer not only cleaned the bathtub, but also used chlorine-containing detergents to re-treat the entire floor." Yang Lin lay on the ground and observed the tile joints with a magnifying glass: "The report from the High-tech Zone did not mention that the caulking here has fresh scratches, as if something was cleaned with a sharp object."

The two came to the living room, and Yang Lin noticed a very fine scratch on the edge of the coffee table: "This position is 78 cm high, which is consistent with the height of the violin head hitting." He compared the photos of the scene, "The previous investigation did not record this detail, and it may have been regarded as ordinary wear and tear." Yang Sen took out a spectrometer and tested the scratch: "It contains metal components, which is consistent with the material of the strings. Not only is Li Xiaomin's violin missing, but it may have also experienced a violent collision here."

When checking the entrance, Yang Sen suddenly stopped: "Wait." He gently slid the electrostatic adsorption device on the door frame, and a translucent plastic film slowly appeared, with several fingerprints clearly printed on it. "The luminol test in the high-tech zone covered the entire door frame, but did not find this." He carefully removed the film, "The murderer may have worn gloves when committing the crime, but accidentally rubbed off the protective film on the surface of the gloves when leaving."

In the study, Yang Lin frowned at the music books on the bookshelf: "The High-tech Zone only counted the number of items, but did not find any abnormal arrangement of the music scores." He pulled out a few music scores, "The order of these Beethoven scores is completely opposite to the practice plan on Li Xiaomin's schedule." Yang Sen used a microscope to observe the gaps between the pages of the book, and said in surprise: "I found something! There are tiny sawdust here, and combined with the metal composition of the scratches in the living room, it may be the fragments that flew when the guitar head broke."

The two worked until the sun set, and the whole room was filled with lights from various detection equipment. Yang Sen looked at the dense data in the record book and shook his head helplessly: "Although so many details have been discovered, a complete chain of evidence cannot be formed at present. These clues are too scattered and have no clear direction." Yang Lin sealed the last evidence bag and glanced at the photo of Li Xiaomin on the wall: "But it is certain that the initial investigation of the high-tech zone missed too much key information. The murderer's crime process is more complicated than we thought. Li Xiaomin's violin may be the key to solving the mystery."

As the night deepened, when the two left, Li Xiaomin's house fell into silence again. Those newly discovered subtle clues were like pearls scattered in the darkness, waiting for more evidence to string them together into a necklace of truth.

After you and Yang Sen returned to the Criminal Investigation Brigade, you started working non-stop.

In the technical analysis room of the Criminal Investigation Brigade, the cold light of the fluorescent screen reflected the tense faces of everyone. Yang Sen slammed the hair and fingerprint test reports on the table. The sound of the papers hitting each other was particularly harsh in the silent space: "The mitochondrial DNA of the hair and the fingerprint patterns all match Li Xiaomin herself. The plastic film found on the door frame before was just left when she replaced the door lock protective film."

Lu Chuan stared at the bright red identification results on the report, his brows knitted into a knot. The clue map on the whiteboard, which had been gradually becoming clear, was now shrouded in a thick fog. Zhang Hui flipped through the reorganized photos of the scene and suddenly said, "Those newly discovered bloodstains and detergent residues, they couldn't have been done by Li Xiaomin herself, right?"

"The murderer is likely familiar with the criminal investigation process." Yang Lin called up the three-dimensional bloodstain model, and red dots flashed on the screen. "He deliberately left misleading traces and even used Li Xiaomin's belongings to forge evidence." His fingers ran over the simulated bloodstains on the model in a half-kneeling posture. "We previously speculated that the victim was half-kneeling, which means that the murderer had absolute suppression when committing the crime. This is definitely not something that Li Xiaomin could have directed and acted on her own."

The case analysis meeting lasted until late at night. The heavy rain outside the window hit the glass, just like everyone's unresolved anxiety. Lu Chuan finally decided on a new direction for the investigation: "Since the clues at the scene are temporarily interrupted, we will cast a wider net. Revisit all of Li Xiaomin's social relationships, focusing on those who have contacted in the past three months, and no details can be missed."

The new round of visits was like looking for a needle in a haystack, but everyone was still very alert. (End of this chapter)