National Forensic Doctor
Chapter 230 - 230 221 Breakthrough

230: Chapter 221 Breakthrough 230: Chapter 221 Breakthrough Luminol Reagent is the substance often used in films and television series to reveal the presence of blood.

In earlier years, Luminol had to be mixed on the spot, but now there are pre-packaged products available for use.

Luminol possesses an exceptional ability to detect bloodstains.

How exceptional?

Bloodstains from several years ago can be revealed unless they have been specially treated.

Even if blood is diluted a million times, which is to say a drop of blood in a bathtub full of water, it can still be easily detected by Luminol.

Therefore, trying to wash away blood traces with water is practically futile in the face of Luminol.

This is also why it is generally not advised to commit murder within one’s home.

Luminol is a very affordable reagent.

0.1 grams of Luminol, combined with 5 grams of sodium carbonate and 6 milliliters of hydrogen peroxide, can produce a 100 milliliters bottle of Luminol solution.

It is also applied by spraying, so inspecting a room doesn’t take much time.

Moreover, the current DNA technology is very advanced with high sensitivity.

The bloodstains revealed by Luminol are softened, and with a swab of a cotton stick, the DNA can be easily obtained for testing.

Furthermore, most toiletries and cleaning products are unlikely to clean bloodstains to a degree that Luminol would not detect them.

To interfere with Luminol, an oxidizing agent must be used.

The most common ones are bleach powder and potassium permanganate, but even they cannot completely obstruct the Luminol reaction since the glowing times of hemoglobin and the interferents are different.

An experienced forensic investigator can easily spot the difference.

As for the bathrooms in hotels, naturally, these substances are not used.

Besides, the cleaning staff of the bathrooms are never known for their diligent and conscientious work.

Jiang Yuan managed to take several photos before the Luminal’s glow faded and then said, “Master, you can turn on the lights now.”

“Alright.” Wu Jun turned on the lights, his face beaming with a smile.

“So happy?” Jiang Yuan put on gloves and a mask, took out a cotton swab, and began to work methodically.

Unless there was an unexpected development, these bloodstains were likely the key evidence for this case.

Bai Yuequn entire suite of lies couldn’t accommodate a single drop of Yuan Yutang and her boyfriend’s blood.

Wu Jun watched Jiang Yuan roll the cotton swab with an air of relaxation and said, “No matter how cunning the villain, he still has to drink my ‘penis washing water.’

“We haven’t done the DNA test yet,” Jiang Yuan reminded.

Wu Jun laughed, made a circle in the air with his hand, and said, “Unless both of their hemorrhoids burst here, this is definitely where Bai Yuequn cleaned the bloodstains.”

Jiang Yuan hummed in agreement, slightly correcting, “Unless in recent years, a guest’s hemorrhoids burst in the bathroom, this is essentially where Bai Yuequn cleaned the bloodstains.”

“We could be even more precise, but…

where did the bloody clothes and the murder weapon go?” Wu Jun slightly furrowed his brow.

In the city, disposing of bloody clothes and murder weapons is quite difficult.

Jiang Yuan didn’t have an immediate solution and simply said, “Let’s first break through Bai Yuequn alibi witness.”

“That’s true.

If Xu Yi keeps silent, scaring him with the prospect of being an accomplice to a homicide should make him talk,” Wu Jun had some experience with this.

Suspects in the interrogation stage are not allowed to see their lawyers; they only hear what the police tell them.

Therefore, if one hasn’t studied well and gets involved in a murder, they are at a disadvantage due to a lack of information.

Bai Yuequn fencing teammate looked like an easy target to bully.

…

In the evening,

Lei Xin had prepared a meticulous plan and was ready to personally interrogate Xu Yi.

Lei Xin started his career in pre-trial hearings.

In fact, when there used to be a pre-trial hearing department, the police officers who were assigned there were always very competent in their field.

His teeth stained yellow from smoking were a testament to his history.

After carefully reviewing the DNA report again, Lei Xin walked into the interrogation room with his fighting spirit high.

Xu Yi, tall and thin, looked like a giraffe playing a bondage game after his hands and feet were locked to the interrogation chair, only his head stretched out unusually long.

“Do you know what we want to ask?” Lei Xin had interrogated Xu Yi before, having briefly spoken to him earlier, and this time he sat down across from him with a smile and laid down a thick stack of files.

That pile of files, which looked like a multitude of evidence and testimonies, also drew Xu Yi’s gaze and he couldn’t help speculating in his heart.

After a while, Xu Yi shifted his gaze back and said as if finding his voice, “I know, you want me to turn in my testimony.”

“I’m trying to save your life, kid, not watch you become a scapegoat for someone else.” Lei Xin decided to bring out the heavy artillery, starting with several surveillance photos, saying, “These are photos of Bai Yuequn casing the joint.”

The Surveillance Analysis Squad found a lot of videos, and Lei Xin showed them to him one by one.

Xu Yi glanced at them and turned his head away, saying, “No need to , that’s just the cinema closest to the bar street.

Going to the movies, that’s all, what kind of casing is that?”

“Well, that explanation has some substance to it.” Lei Xin took the opportunity to give Xu Yi a compliment, then continued by showing the damaged surveillance footage from Screen 2 and the time of the damage.

Next, he displayed photos of Bai Yuequn entering and exiting the cinema around the same time.

Xu Yi, seeing the latter pictures, simply closed his eyes, saying, “If you really can’t find the murderer, just arrest us directly; there’s no need to make all these nonsensical things up.”

Lei Xin watched his expression and silently produced his trump card, saying, “Here, I also have a DNA report that was collected from the hotel room you stayed in that night, this—how do you explain that?”

Xu Yi was taken aback, “What do you mean?”

“In your hotel room, there were blood traces of two victims, not a small amount.” Lei Xin said calmly, “It must be the blood that Bai Yuequn didn’t clean up properly at the scene, right?”

Xu Yi hesitated for a moment and said, “You’re lying to me.”

“Let’s say I’m lying to you, if I go now to the bathroom of the hotel room you stayed in, do you think I will find the blood traces of the two victims?” Lei Xin held the DNA report in his hand, not even giving it to Xu Yi.

Xu Yi could no longer cope.

“Do you really want to end up like Bai Yuequn, spending a lifetime in jail?” Lei Xin began the sympathetic approach.

Xu Yi’s expression shifted slightly, then after a while, he said, “I still have work.”

“What?”

“Bai Yuequn promised me, if I don’t talk nonsense, he’ll find me another job.

If the two of us get criminally charged, it’ll be hard to find work.” Xu Yi’s voice was very light.

Lei Xin was overjoyed; as long as he began talking, the rest of the questions would be easier to ask.

Lei Xin asked again, “On the day of the movie, did Bai Yuequn watch the film with you in Screen 2 and did he leave at any point during the showing?”

Xu Yi said, “I don’t know.”

Lei Xin immediately lost his patience; if it were acceptable to devour someone, he would have ground Xu Yi to dust in his mouth.

“I really don’t know.” Xu Yi said, “As soon as I entered the screening room that day, I felt tired, so I fell asleep.

Whether Bai Yuequn left or if he left at all, I have no idea.”

This statement couldn’t incriminate Bai Yuequn, but it was enough to shatter Bai Yuequn’s alibi.

Not just Lei Xin, but everyone monitoring the surveillance couldn’t help but chuckle.

Lei Xin pressed on, “Then, on the way from the cinema to the hotel, did you notice Bai Yuequn discarding anything?”

Xu Yi said, “No.”

“What about the smell?

Didn’t you smell anything?”

“I was wearing a mask at the time.

An N95 one, so I didn’t smell anything.”

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