Transmigrated into Conan, his ability is Rhodes Island

"No? How is that possible! Are there any signs of wiping? Could it be that the perpetrator wiped away the victim's fingerprints while wiping away their own?" Kenji Hagiwara was somewhat bewildered by this reversal.

“We’ve considered this scenario, but the forensic lab checked and there were no signs of wiping on the bottle,” the officer replied. “Right now, the only possibility we can think of is that this wasn’t the anhydrous ethanol the victim purchased.”

"Isn't this just going back to square one?" Kenji Hagiwara looked troubled.

“I think this is irrelevant.” Matsuda Jinpei walked over from the side, having just finished listening to the entire statement from the employee in charge of managing fire equipment and facilities, and rubbed his hair in frustration. “What does it matter whether it’s a victim’s or not? Maybe the cleaning lady just made a mistake… or in other words, it’s more in line with my reasoning if it turns out it’s not a victim’s.”

Akihara Kazumitsu nodded. "Yes, but what about the evidence to support your reasoning? Up until now, it's all just your assumptions."

Matsuda Jinpei turned his head and pointed to the middle-aged employee who was still taking notes, saying, "He will take us to check the fire control room and the fire water tank on the top floor later. If my reasoning is correct, there will definitely be clues there."

Akihara nodded again, then turned to Date Wataru. "You police... well, if you commission an agency to do an autopsy, how long does it usually take to get the results?"

After thinking carefully for a moment, Ida Wataru replied, "It depends on the complexity of the case. I've heard from my seniors that for simple cases, such as autopsies in traffic accident cases, which only require investigating the cause of death and taking wound samples, it can be completed in just a few hours."

“In a case like this, we would first conduct an external examination, followed by an autopsy, then possibly chemical analysis, pathological examination, toxicological examination, and finally ignition source analysis. The procedures are numerous and complicated, and could take several days or even weeks.”

Akihara slightly raised her hand. "Could they first conduct a chemical analysis to check if there are any residual manganese ions or titanium dioxide in the patient's lymph nodes?"

“I need to ask the section chief for his opinion…” Date Yuki looked at Akihara Kazuhiro with obvious doubt. “But can you tell me why?”

Qiu Yuan pulled out the crime scene photos he had given him earlier, close-ups of the severed limbs. He had circled the top of the victim's charred and mangled limb with a pen. "Look here," he said, "although it's not very clear, there's a distinct color in the exposed flesh of the victim's limb that's different from the rest..."

Everyone crowded around and examined the finger pointed at by Akihara Kazuhiro, but they still couldn't figure it out.

"Uh, is there a problem?" Matsuda Jinpei asked.

Akihara sighed helplessly and put away the photos. "Alright, maybe it's the image quality... Anyway, I saw it at the scene just now. What's exposed should be the lymph nodes in the victim's back of the knee. Normally they should be white, but they're purple now."

The others present were only slightly better than the average person when it came to things like pathology, but only slightly, and their eyes were filled with a clear sense of bewilderment.

"Um...so, what does a change in the color of lymph nodes mean?"

"Infection, embolism, or... drug effects."

"Drug effects?" Upon hearing this, Kenji Hagiwara stroked his chin, pondered for a while, and then asked, "So that's why you had the forensic doctor conduct a chemical analysis first? So, you disagree with Jinpei's reasoning?"

Akihara glanced at Matsuda Jinpei with a smile, then looked away, revealing a friendly smile. "It's just so we don't overlook any possibility."

Matsuda Jinpei laughed as well. "According to you, the mutation isn't only caused by poisoning. If the victim had tattoos, some chemicals from the tattoo ink could have seeped in and turned the lymph nodes purple."

“That’s right, that’s one possibility.” Akihara Kazumitsu nodded. “So, does Yokoyama Jiro have tattoos?”

So everyone looked at Date Wataru, anticipating his answer.

Date Kou scratched his head. "To be honest, I really don't know... I'll look it up later."

At that moment, Matsuda Jinpei recalled a new possibility. "Could this be... 'cyanosis'? It seems like it can occur in both congenital heart disease and anemia."

Akihara Kazumitsu shook his head, denying his conjecture. "Cyanosis refers to the skin or mucous membranes appearing dark purple or bluish-purple, which is a completely different concept from what I just described."

"The cause is insufficient oxygen content in the blood, which prevents hemoglobin in the blood from fully binding with oxygen. This occurs in areas where the skin is thinner and the blood vessels are more superficial, rather than in lymph nodes."

Akihara Kazumitsu shrugged and summarized his point of view. "However, now, there's an even bigger possibility than the tattoo. Yokoyama Jiro happens to be a drug tester, and perhaps some kind of purple chemical component that isn't absorbed by the human body remains in his body from the drugs he's testing—this explanation seems more reasonable."

Kenji Hagiwara frowned, recalling Akihara's train of thought. "The investigation report didn't mention what drug Jiro Yokoyama was testing."

“I guess there might be an antacid. But that’s just a guess, the rest still needs…” Akihara Kazumitsu looked at Date Wataru again.

Date patted his chest. "Don't worry, leave it to me. I'll find out."

"Why is it an antacid?" Kenji Hagiwara asked curiously.

“Sometimes we have to admit that the differences between individuals on this earth prevent us from fully understanding each other. Words may be one way for people to understand themselves, but they are not a panacea. I understand your curiosity, and I will try to give an answer before the final moment arrives. But I cannot draw any definite conclusions until I have collected enough evidence.”

"speak English!"

"I don't want to talk about it without evidence."

Kenji Hagiwara sighed, rubbing his forehead. "Okay, okay, so now we..."

At that moment, Matsuda Jinpei suddenly realized something. "Hey, don't assume my reasoning is wrong! We should be investigating the fire control room and the fire tank now!"

Seeing that everyone was about to follow the middle-aged employee to conduct an on-site investigation, Ida Wataru said to them, "Then I'll go report the conclusions we just reached to the section chief, and then call the commissioned forensic institution after I'm done."

"Okay, thank you for your hard work~"

……

The fire control room of the shopping mall is located on the first floor. It is equipped with automatic fire alarm control equipment and fire control equipment, which are used to receive, display and process fire alarm signals. It is figuratively called the "heart" of the building's fire protection facilities.

The middle-aged employee skillfully pressed the keys on the desktop computer.

He showed the officers the interface that popped up on the screen. "Yes, there was an alarm message after I finished my shift. Normal operation continued until 30 minutes later, when no smoke was detected, and the spraying stopped."

Akihara Kazuhiro exclaimed, "Huh?" "It's normal work, are you sure?"

"Of course! I've been in this business for over ten or twenty years, it's not your place to comment!" The middle-aged employee became even more impolite when he saw that Akihara Kazumitsu wasn't wearing a police uniform.

Akihara Kazumitsu ignored the other person's tone and pointed to the time on the screen. "But compared to the time when the surveillance video started smoking after it was uploaded to the wall pillar, the spraying started at least 20 minutes later."