Evidence hunting forensic 4 unsolved case code

The clerk greeted an employee of the ashes depository in advance, and Tang Zhe learned from them, and the other party led them into the employee passageway.Passing through the cold and gloomy aisle, the staff led them into a small room with unremoved wreaths and black banners. Visually, it was a room used as a mourning room.Dai Minzhi's ashes have been taken out of the locker and placed on the light white tabletop in a gray and cheap ceramic jar. It seems that the person who deposited her here did not intend to bury her in a grand manner.

According to the staff, it is free for the first three years to deposit ashes, and a storage fee will be charged from the fourth year. If the ashes are not paid for more than two years, the depository has the right to dispose of them.Most of the ashes here are stored for more than five years.Zhou He asked how to deal with those who did not pay, the employee shrugged his shoulders and said two words: down.

This sounds a bit cold.Death is like a lamp going out, and it is a kind of luck for someone to bury and worship, but it is only a form of remembering the dead, and it can be engraved in the hearts of future generations, which is another form of life.As said in Coco, there are three times of human death: the first is biological death; the second is the death of social status after a funeral; the third is the last death in the world. People, forget you.

In an instant, Tang Zhexue suddenly understood Lin Yang's attachment to Lin Dong.Ask yourself, who is not afraid of death?But Lin Yang is really not afraid.What Lin Yang is afraid of is that no one will remember him after death, his soul will be lonely, and he will fall into hell forever.This should be related to the religious influence he received in Myanmar. Tang Zhe learned that Lin Yang believed that there is a place to go after death, but that place should not be colder and darker than the world.

As an atheist who firmly believes in the supremacy of science, Qi Ming has no intention of mourning the autumn and the spring with others, and the right way is to hurry up and work.He took the black box in Zhou He's hand, placed it lightly on the table, "clicked" the lock twice, put on his gloves, and took out the digital microscope lens, console, controller, data cable and imager in sequence. flat.

Seeing the forensic doctor using this equipment for the first time, Tang Zhe couldn't help being curious: "How much does this set cost?"

"Less than 20 million."

Qi Ming answered while installing the camera on the shelf, his tone was as relaxed as others said "less than 20 yuan".Tang Zhexue was unable to complain about this. I heard Luo Jianan talk about it before, saying that in Qi Ming's eyes, things with less than eight figures are basically not "expensive".Of course, what the score is, it must be too expensive for him to spend 10 yuan on a roll of toilet paper.

Qi Ming adjusts the equipment here, and Zhou He samples the ashes there.After uncovering the lid of the porcelain bottle, Yang Kelin poked his head over to take a look, and muttered, "Why is there no ashes?".

"There is ashes, it's underneath, now, look."

Zhou He turned on the flashlight and looked inside, only to see less than half a can of fine powder accumulated under the massive broken bones.Using tweezers to pick out a piece of broken bone, Zhou He scraped the bone debris onto a clean glass slide, and then used a slender metal spoon not much bigger than an ear digging spoon to hold a little bit of real bone "ash" and put it on the on another glass slide.

Next is staining, coverslipping, and machine.Different from Tang Zhexue's previous understanding of microscopes, this digital microscope does not require the human eye to observe in front of the lens barrel, but uses the console to control the zoom of the lens, and the image will be presented on the tablet.As Qi Ming operated the controller, the picture gradually became clearer. After tens of thousands of times of magnification, the powdery bone dust appeared clearly like grains of sand.And in the gaps of these bone dust, there are bunches of needle-like objects, the dyed edges are clear and sharp.

Is this normal?Tang Zhexue and Yangkelin looked at each other in blank dismay. Anyway, they didn't know whether there should be such a thing in the ashes.Turning his gaze to Qi Ming, he saw that Qi Ming's face was slightly concentrating, as if he was thinking about something.

Suddenly, his eyebrows twitched slightly, and there was a trace of relief in his eyes, and then he asked, "Rice, what do you think is this?"

Tang Zhexue took a moment to realize that Qi Ming's name was Zhou He. This must have been a nickname he had given to him without remembering his name.I don't know what kind of impression Zhang Jinchuan's name has in Qiming's mind. It looks like there are many metal characters, maybe forks and spoons, but they can't be separated from the dining table anyway.

Zhou He looked nervous, and opened his mouth, answering is no, not answering is no-if he answers, he is afraid of being wrong, and if he makes a mistake, he will be scolded.Before, he asked Gao Ren how he persisted in Qi Ming's cold-blooded and high-handed leadership style for so many years.Gao Ren told him that in fact, he couldn't bear Qi Ming's harshness at first, and secretly shed tears several times after being scolded.But with more and more practical exercises, I gradually figured out that Qi Ming's strict and almost abnormal requirements are not because they are newbies and inexperienced, but to prevent the wrong cause of death due to the mistakes of forensic doctors. Or target the wrong suspect.Comparing the two things of making a major mistake and being scolded, it is easier to see which is more important, and I am relieved at once.

After waiting for a while, Zhou He didn't answer, Qi Ming didn't show disgust, but turned to Tang Zhexue, "I'm going to take fifty grams of ashes back to test the oxalic acid content, you can discuss it with the administrator. .”

"Is this oxalic acid?" Tang Zhexue asked, pointing at those needle-like objects.

"To be precise, it's calcium oxalate crystals," Qi Ming explained. "Normal human body contains a certain amount of oxalic acid. Excessive amounts will lead to calcium oxalate monohydrate stones. Calcium oxalate monohydrate has poor thermal stability and will decompose during cremation. After exposure to the air, it exists in the form of calcium oxalate in the ashes, so calcium oxalate crystals in the ashes are relatively common, but oxalic acid is toxic, and if it exceeds 71 ​​mg per kilogram, it is the lethal dose. This—” He pointed screen, "The crystal density is too large, the oxalic acid content in the body of the deceased must have exceeded the standard before death, and the specific value needs to be measured by an instrument."

After digesting Qi Ming's popular science for a while, Tang Zhe asked: "You mean, Zhao Zunyi poisoned Dai Minzhi with oxalic acid?"

"No, oxalic acid has strong olfactory stimulation and strong corrosiveness. No one would be foolish enough to drink oxalic acid directly. It would burn the digestive tract, and the doctor would find out immediately when sending it to the doctor."

"..."

Tang Zhexue didn't dare to ask any more questions. There were juniors by his side, so if he asked too many questions, he would appear to have a low IQ.Talking to Qi Ming, sometimes the embarrassment is not because you don’t know the answer—knowledge is boundless—but because you don’t know what to ask.

"Ethylene glycol?" Zhou He interrupted suddenly. Toxicology is his strong point. He was able to pass the internship application because he won the favor of Qi Ming with a professional paper on toxicology. It's just that there is a certain distance between practice and theory. I didn't realize it for a while, "The metabolite of ethylene glycol in the human body is oxalic acid. Excessive calcium oxalate crystals block the renal tubules and cause renal failure, and lower the pH of the blood. The deceased had diabetes and poisoning of ethylene glycol metabolites. The symptoms are masked by the symptoms of ketoacidosis."

There was a hint of appreciation in Qi Ming's eyes, and he agreed: "Indeed, ethylene glycol poisoning is actually oxalic acid poisoning, and its metabolic intermediate products, such as glycolaldehyde and glyoxylic acid, are also directly toxic to the kidneys. The cause of death was judged to be multiple organ failure caused by renal failure, which eventually led to heart failure, so if the oxalic acid content reaches the lethal level, then it can be confirmed that she was poisoned."

"Then can ethylene glycol be drunk directly without being discovered?" Tang Zhexue felt that asking this question would not make him appear to have a low IQ.

"No, ethylene glycol is sweet." Qi Ming raised his face and thought for a while, "Ethylene glycol is mostly used in vehicles and industrial antifreeze, um... probably no one will drink the antifreeze directly, wait a moment. "

He called Du Haiwei, hung up the phone and asked Tang Zhexue: "The target suspect you are targeting is engaged in pesticides?"

Tang Zhexue nodded.

"Ms. Du said that ethylene glycol is often used as a catalyst in the production of pesticides, so it is indeed possible for the suspect to obtain high-purity ethylene glycol, but how to use it..."

"Just give me the result, and I'll interrogate him."

Tang Zhexue suddenly had the urge to gear up, but it was his turn. Just listening to Qi Ming and the others talk about technical things, he felt like an idiot.

TBC

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