Patricia Chavez
Chapters 16. Experimental Analysis

Another chapter that makes mumbling. But I have to show it here. This chapter explains how police have their own methods of solving complex cases using science and using existing technology. Please patience. This chapter is full of trials 🤭.

The police investigated the cause of the death, using a dummy (a mock doll) and a ladder experiment with the exact same configuration as the crime scene. Such as site hike dimensions and others based on detailed search warrants on actual stairs. Examinations are carried out by public inspectors and police officers.

From the analysis of the dummy fall experiment from the stairs, where the concrete staircase measuring 178 cm long, 265 cm high, the width of 90 cm consists of 28 steps with a tread height of 17.7cm and a height of 23.0 cm, except the uppermost rungs have a footprint of 24.0 cm and a height of 26.0 cm with a fringe of anti-slip vinyl material. The slope of the stairs is 54 degrees except the top of the stairs is 48 degrees. A handle is installed on one side of the staircase wall with a height of about 80 cm from the edge of the stairs. The height from the 1st floor to the emperor above the stairs is 210 cm.

The victim died two days after falling. Based on the results of the autopsy, the occipital area of the head and upper left shoulder bone suffered severe cracks. Clear elliptical punch marks are seen in the occipital area of the head, and bruised on the right side of the back. The victim fell backwards from the stairs and the back of the head was hit hard on a solid flat surface. The leading causes of fatal deaths are skull fractures, intracranial injuries, and brain hemorrhage from impact. Some ribs may break when giving manual resuscitation of artificial respiration. However, it is inconceivable that an elliptical reddish lump in the upper front of the left chest will be visible, if the victim falls backward from the stairs.

Based on investigations of experiments falling backwards from the stairs and by using a doll on a flat surface, it was observed that the first impact on the back of the head caused the most severe injury in one second, because it keeps rolling downstairs. In this experiment, the focus was placed on the impact blow on the head right after falling backwards. These actual fall patterns are examined to determine the possible fall patterns that cause fatal head injuries. Various possible fall patterns are analyzed if the fall is naturally and fall deliberately. Each falling pattern is recorded by a high-speed camera. Each of the following three major experiments was conducted once.

Natural fall assuming an accidental fall

- A rear-facing doll is propped up in an upright position at the top end of the stairs, and leaned back at a very slow speed until it falls naturally in its own absence from outside forces.

Deliberate fall assuming fall due to pushing with standing still position.

- Dolls standing facing back are intensively pushed by boys and girls, then adults at the top of the stairs.

- Dolls standing backwards on thin wheeled platforms are driven at a speed of 1.6 km/h driven intensively by adults at the top end of the stairs and 1k/the clock is intensively pushed by boys and less than 1 km/h is intensively pushed by girls at the top end of the stairs.

To extrapolate the possible pattern of casualties from the stairs, have prepared dolls, head models and imitations of stairs with a similar configuration to the actual stairs. The weight of the doll is 20 kg, and its height is 140 cm, roughly equal to the weight and dimensional configuration of the victim. The main structure of the doll was made of urethane-coated steel. (Urethane is a term that refers to at least three different substances: ethyl carbamate, carbamate, or polyurethane. Although all of these substances are related based on the chemical composition of molecules of nitrogen, hydrogen, and oxygen, their uses are different. Urethane-based compounds are commonly used as abrasion-resistant coatings, adhesives, corrosion-resistant formulations, and injection molds).

As a result, every puppet arthro could not move except the shoulder joint. The center of gravity of each limb and the entire body weight is set by inserting lead or iron into the doll. A clay head model with a similar dimensional configuration to the victim was made. This clay head model is used to locate the designated impact point of the actual steep dimensional configuration of the tread and incline before performing the experiment. Artificial stairs made of concrete.

A clay head model with dimensions similar to the victim's head is used to examine the point of injury to the rungs. Assuming that the impact of the first blow to the back of the head occurs on the tread surface or on the edge of the rungs, the, signs of external injury to the back of the head are observed such as planar injury in the parietal area of the head. Linear injury in the occipital region of the head. A doll, whose head was covered in paper coated with a red dye that was sensitive to pressure, was pushed up the stairs. Red scars are observed in the parietal area of the head. Wounds due to fatal impacts that occur in the victim in the form of elliptical punch marks in the occipital area of the head.

The doll's head was bumped on the fourth rung of the lower staircase if it fell naturally in the absence of any outside force. The head of the doll is bumped on the third rung of the lower seat, in case of an outward force against a standing still posture. The head of the puppet is bumped on the second rung of the lower rung, if the moving puppet is driven at a constant speed of less than 1 km/h.

Based on each fall experiment using a doll, the doll's head was bumped on each experiment, the victim fell backward and clearly visible occipital area of the head was hit intensively on a flat surface, flat surface, like the bottom landing, seen from autopsy evidence that shows the presence of elliptical-shaped wounds in the occipital area of the head. Analyzing the results of this experiment even when deliberately pushing it with a backward motion, the back of the doll's head had no impact on the lower landing, but on the tread surface.

Based on the results of the experiment, it was very unnatural for the occipital area of the fatal victim's head to be hit strongly on a flat surface such as a lower landing in the absence of a stronger external force. The reddish, elliptical bruise on the upper front of the left chest is thought not to have been caused by a falling impact, but rather by an intentional forceful push by a girl.

Based on an experimental analysis of the dummy's fall from the stairs and observations of fatal head injuries, it is highly suspicious that the victim accidentally missteps, loses balance at the top of the stairs, and is unable to find the victim, and fell from the top floor to the bottom floor. This experimental method and analysis explain the possible pattern of fatal falls from a ladder whose fatal cause remains controversial. The question is, who is this girl?

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