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Murder Mystery Lab Report Essay

562 Words3 Pages

Solving a Murder Case with Transitions Metals and Suspect’s DNA A writer named Milo was murdered late one night in an alley by a knife. DNA was found on the knife and was taken from four suspects of the murder (French, at. al. 106). The purpose of this lab is to use a variety of redox reaction on the different DNAs. The different samples will change to different colors to determine the difference in the DNAs and how they compare to the DNA on the knife (French, at. al. 106). To determine the murderer a redox reaction was used. There are two parts of a redox reaction, oxidation and reduction. A redox reaction is chemical reaction that transfers electrons. If a reactants oxidation state is more positive than the product then it is undergoing …show more content…

Using the reaction of KMnO4 and the different bases of DNA (adenine, cytosine, guanine, and thymine). The change of the oxidation number of manganese causes a change in color of the DNA of each suspect. Each person’s DNA came out to be a different color after reacting with KMnO4: Arnold-Blue cloudy; Cindy-Dark rusty orange; Gary- Clear; Tina-Yellow/orange; Knife-Clear. The purpose of this lab to solve the murder using redox reactions was met. Gary’s DNA and the oxidation number of manganese in the GMP reaction was the same as the knife. Both oxidation numbers of manganese in these reactions were +7. Many errors could of happen during this lab. First, one of the samples got more KMnO4 than another. It could have reacted differently causing a difference in oxidation number. Prevention for this would be to measure the KMnO4 precisely. Secondly, the test tubes were not cleaned out. If there was residue from other chemicals on the test tube there could be an error in the reaction. Cleaning out the test tube before starting lab could prevent this. Finally, residue on gloves could have got into the solution. This could have caused an error in the reaction. Mixing another way could have prevented this

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On September 9th, in Anytown, USA, a mysterious death was discovered when a woman named Anna Garcia was found face down dead in her home. It all started when Anna’s neighbor, Doug noticed how Anna’s dog was constantly barking for two hours straight which was very unusual in the quiet suburban neighborhood. Doug realized this and tried calling Anna multiple times and rang her doorbell but when no one answered, he decided to call the police at 9:45 a.m. The EMT and the police arrived at 9:56am but the door had to be broken down and there was Anna lying face down in the entry of the hallway.

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The reasoning was because the cuticle and the medullas are similar in comparison. The unknown substance found at the crime scene turned out to be Acetylsalicylic acid because it had the same appearance and reaction as an acid. The time of death of Anna Garcia was approximately at 7:00 am. The blood spatter lab concluded that as the height of the blood droplet increases, then the diameter of the blood spatter increases. The DNA found at the crime scene was Anna’s DNA.

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The first step is to place a drop of distilled water on a sterile swab and swab a small portion of the suspect substance, The place the swab against a presumptive blood test and an immediate color change should occur if the reaction is positive. If the stain is negative the suspected blood stain may be ignored. If the reaction is positive an evidence number is assigned to the suspected blood and the stain is photographed and measured. The forensic technician should note the stain was collected due to a positive reaction. The blood is then collected and packaged, and the package is sealed and labeled for identification Upon collecting blood if the blood is wet a sterile swab should be rotated in the stain, transferring the blood to the swab.

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963 Words | 4 Pages

The fingerprints of Surratt and Anderson were both tied to crimes involved in this case. The defendants at trial were being convicted on two counts of second-degree murder. The state had to prove beyond a reasonable doubt that the defendants had killed Cook and Kirby. Cook and Kirby were discovered in a container with a lid that was taped shut and painted over, this was known because of where the fingerprints were impressed. Although their bodies were found, no murder weapon was ever discovered by the autopsies performed showed Cook and Kirby were both killed with fatal gunshots.

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Episode seven of Making a Murderer begins with Steven Avery’s father, Allan Avery exclaiming: “They set him up!” Ironically, there is a decent amount of evidence to prove that—in this case—the “good guys” may not be so good. Due to the Avery lawsuit against Manitowoc County Police Department, Manitowoc police were not supposed to be on the Avery premises. But they were, and that car key in Steven Avery’s bedroom was found by police that were not supposed to be there.

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1042 Words | 5 Pages

The case of Anna Garcia is still a mystery. Anna died on August 14th at 7:00AM in Anytown, USA. The death occurred on a 92 degrees(F) summer morning and it was 73 degrees(F) inside her house. Her death is categorized in a natural manner. The scene of the crime is a small 200 x 300 centimeters, typical, everyday living room, around 10 items, with a coffee table, a lamp, and etc.

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In episode 5 “The Bones That Weren’t,” a skateboarder sneaks into a construction site and stumbles upon a human skull protruding from the recently poured concrete. While at lunch, Dr. Temperance Brennan and Booth receive a call about the findings at the construction site. Brennan determined that the skull belongs to a male in his late 20s. In the lab, the team was about to determine that there was only the skull in the concrete. With the use of a lab technique, they were able to create an image of the victim’s skeleton.

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In this paper I will be comparing contrasting two various aspects of forensic sciences used, and talking about the different tactics used to identify suspects; as well as the contrasts between the two methods. The man I will be talking about is John Wayne Gacy. The two methods I will be going over are, Finger print DNA and Forensic toxicology. These two are very similar, but made substantial differences in the evidence in his case. John Wayne Gacy was a murderer from Chicago, Illinois.

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There comes a time in the criminal justice system where a law that was written to protect us will be challenged through a court case. That case will eventually make history and will become a reference in future cases with similar dilemmas. In 1983, one particular case met the criteria (Arizona vs. Youngblood). In this case, Larry Youngblood was convicted by a jury in Arizona of child molestation, sexual assault, and kidnapping of a ten-year-old boy. Both a criminologist for the State and an expert witness for the defendant testified as to what they believed the results were from the tests that were performed on the samples shortly after they were collected, they also commented on later tests performed on the samples from the boy’s clothing

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There are many important factors in crime scene investigation, one of those involves serology and observing the blood spatters at a crime scene. Many steps are taken when dealing with blood at a crime scene, some of which are if the substance is actually blood, blood typing, discerning the origin of the blood, the direction of travel of the bloodstain, what weapon would have caused the bloodstain, etc. Serology and dealing with bloodstains can be a very difficult task for criminalists because blood also deals with DNA, what type of blood it is, identifying who the blood belongs to, what caused the bloodstain, and what direction it originated from. To understand serology, it is probably best for one to understand the nature of blood first.

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526 Words | 3 Pages

Unit 2 Assignment: Evidence Collection Part 1: What are some important first steps that must be taken to gain access to old crime scenes when cases are reopened, as the cases discussed in the Ted Talk? What types of forensic tools were utilized during the cold case investigation? Identify three tools. Explain the purpose of the tool and describe how it was utilized in this cold case investigation.

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Although, in our lab report, suspect ones DNA matched the crime scene when cut with enzyme one, this can be explained by how closely related the two suspects are. Therefore two enzymes were used to cut the DNA; the suspect has to match both. Moreover, the limitation to DNA fingerprinting is, if a person were to have an identical twin. This is because identical twins have the same DNA because they come from the same egg. If a suspect’s DNA matched that of the one being tested, and they had an identical twin, a farther investigation would need to be done.

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1251 Words | 6 Pages

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