Recently, there is a place a zoo keeper at work for a long time by their own breeding tiger attack, he died. This news caused no small concern, but actually look at the domestic and the world in recent years, died under the claws of the beast breeder, the administrator is not the case. Which of course there are loopholes in management and on the facilities, relaxation and so on reasons of self-awareness, but other issues have also been brought to many users: how to judge, it was just an accident, not a murder orchestrated it ?
Touching moment, what happened?
In fact, this concern in a number of detective fiction has appeared. For example, the famous "Sherlock Holmes" series of novels, there is one called "Veiled Lodger" story that circus is a weak woman, and others conspired to murder the long-term abuse of his trainer husband. Their crime weapon is a big stick tops the five big nail, like a lion's paw, and then use it to Bash the head of the victim in an attempt to disguise the whole scene suddenly mad lion killings accident.
In the Victorian era, this story is plausible. However, if such a conspiracy happening today, it will be easily seen through forensic science.
In the forensic science system, there are two principles is considered the industry axiom: the first is the law of material exchange (also translated as "Rocca Law"), and the other is "material divisibility principle." Both complement each other, we will be able to restore those who live what happened to a large extent.
Content material exchange law, a rule is "two objects come into contact, must occur material exchange." For example, when the hand touched the door handle, the hands sweat, dander and other substances will be printed on the door, and the door on the metal particles will stick in your when someone walked grass, soles You may be exposed seeds and soil.
The substance can be divided principle, it is the law of Rocca supplement and refinement, that the answer is "at a particular intensity of external force, how much material exchange occurs between two objects?" For example, a hand free to ask had white walls, might leave a very significant perspiration and when the arm severely grazed on rough exterior walls, can be another example, assume that the suspect's fingernails was found deeply embedded in the victim's dander, it can not be explained only shook hands.
There are traces of it?
Rely on these two principles, then look at the beast wounding zoo / circus, it is easy to distinguish the reasons, to determine the nature of the.
Suppose that in the Sherlock Holmes story, it really happened around us. So, the police forensic investigation team (CSI) will find what flaws it?
First, they will find that the lion's paws, and no contamination on the blood of the deceased. Just with a sterile cotton swab to gently wipe the lion Zhao Jian, then DNA testing than what, you know there is no scratch Lions had the deceased. Even later attacked another person, both mixed with blood should appear on the paws.
In addition, usually the lion in the cage activity, unless the ground is fairly smooth, otherwise there is always some gravel, dirt stick in its claws. And when it really claws embedded into the body of the deceased, these dirt and gravel will be brought in, more or less remaining in deep scars.
Meanwhile, in the lion's claws and the moment her head contact, under such a strong impact, both the hair will be attached to each other in the other body. For example, cracks in the skull of the deceased, a close look with a microscope, should find some fine hairs on the lion's the lion's claw, hair should also find a few victims.
In addition, the human skull is actually quite hard. This means that when a lion suddenly hit enough to cause skull fractures, while it will certainly impact Zhao Jia also a great power, if not broken, but there must be signs of wear, under a magnifying glass on You should be able to see.
If the above phenomenon in most or all of them at the scene observed that the case is accidentally wounding tend if the majority did not find, the more likely case is forged scene.
Another possible
However, there is another possibility that the cunning criminals, somehow angered lion to attack the breeder and casualties, but also tell the forensic science out of it?
I am afraid that is still possible, on the basis of the principle of separability is still Roca law and the substance.
I want to provoke a beast that can take a variety of methods, such as throwing a cigarette butt into the cage, with a long stick with a pointed poke a few lions, meat bun throwing a sandwich of pepper ...... However, both these behavior is not able to work, it would leave traces difficult to erase.
For example it, the burning cigarette butts, will be found careful CSI staff, then found in the above does not belong to the deceased's DNA (from the saliva of oral epithelial cells); lion who was sharp stick poked over the place there subcutaneous bleeding ate spicy chili buns lion mouth will be residual. Once these traces were found, one case point to a strong basis for the crime of murder, but also in the future when the trial evidence.
Significance of Criminalistics
In fact, he says that this beast attacks disguised as murder, all crime, but a small one, more crime, it is a common case of theft, robbery, murder, sexual assault, and so on.
In tracing these crimes and trials, it is needed clues and evidence, and Rocca's law and the law of divisibility substance, both of which was to provide a strong guarantee. Moreover, compared with witnesses, physical evidence have the biggest advantage is that do not lie, not because it was emotional (panic, anger, fear) caused the wrong impression, and therefore more reliable and more credible.
In addition, witnesses in criminal cases, only goodly things. The evidence is not the same, "two contacting, must exchange" Roca law as CSI provides plenty of confidence: the suspect site you want to access, banditry did not leave any traces, in theory, is not possible thing. As long as the case happened, it would surely leave all sorts of evidence, waiting to be discovered, it is interpreted. The need is high sense of responsibility CSI personnel and rich experience, as well as advances in micro-trace-detection technology.
The so-called "To people do not know, is done by night." This sentence put on today, you have a deeper meaning: done, will certainly leave marks, and may become in the future to trace the source of the even if only live animal trainer icy bodies, as well as a only tempered beast, the law will not be so easily deceived.
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