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Forensics Crime Scene Project
Transcript of Forensics Crime Scene Project
To find the blood type of a suspect, you must place three drops of their blood on a dry surface. You then must add a drop of antibodies A, antibodies B, and the antibodies of Rh in the final drop. As long as the are drops are not contaminated, you will then smear the blood drops and their consistency will identify the blood type they have. If the blood clumps after it has come in contact with an antibody, that means it is positive for that type of blood, if it is smooth it is negative. Do to the evidence provided and the expert testimony of the facts it is clear that the two main suspects remaining are George Burns, the brother of the deceased, and Larry Hoover, the employer of the deceased. Both have unfortunate motives and a lack of alibis at the time of the crime. The scene of the crime is consistent with the fact that the murderer entered through the disturbed screen door at the back of the house.
At the same time Steve was leaving his bedroom and entering the dining room. The murderer had most likely been drunkenly stumbling through the TV room leaving his fingerprints across the scene. They had encountered each other with Steve being completely enraged and the murderer threatening death. They got into a physical brawl which left blood and hair from both parties on the floor. It was either George or Larry that took out the gun that would kill the victim with. The gunshot propelled Steve onto is back on top of the dining room table.
The medulla of the hair found at the crime scene matches the both of them, the blood type matches the both of them, but the fingerprints are exact matches for those of Larry Hoover's. This piece of evidence directly places Mr. Hoover at the scene of the crime and can rule out George as the killer. Larry Hoover is the guilty man. Andres Sanchez, Period 6 Forensics Crime Scene Project Steve Burns is a middle-aged man that lives alone, he recently got in a bad break up with his ex-girlfriend Carmen. Steve was murdered in his home with two fatal gunshots to the torso. His body was found face up on top of his dining room table. There were unknown fingerprints around the TV-room and blood drops of the victim on the floor leading into the dining room. There were two blood drops that did not match the victim that were left at the scene along with unknown strands of hair. The door to the master bedroom was left open and the sliding door to the TV room was tampered with. The Main Suspects: Jordan Reynolds: Jordan was dating Carmen before she met Steve. Burns was the reason these two split. Jordan is known for his violent outbursts and unruly temper. Jordan is a suspect because he was seen within the area a few hours before the shooting. The ex-girlfriend of Steve, they did suffer a bad breakup just days before the incident. Carmen isn't a violent type but who knows what she'd be willing to do. She wasn't the most liked by Steve's friends and her good reasons. George Burns George happens to be the older brother of the deceased, the immediate Burns family can vow for the for the fact that they had never been on good term. A recent disagreement over how Steve's life has turned out became physical and both men had to be separated. The hatred is very real between the two. Larry Hoover -evidence that occurs when different objects contact one another
-Dr. Edmund Locard's principle of exchange states,
"Every contact leaves a trace"
Some trace evidence at the crime scene included multiple sets of common unknown fingerprints on the walls of the home and on the murder weapon, a gun left at the scene
the prints were whorls with multiple islands and hooks
Blood from the deceased and an unknown suspect were found around the dining room area
the blood was tested and said to be O-
Hair was found that didn't match that of Steve. Human hairs are unique in that their medullary index but typically used as class evidence and to rule out suspects
the unknown hair had a fragmented medulla Exhibit A: Fingerprints This is the former boss of Steve, they had gotten into many altercations after Steve was hired a few weeks ago. Steve would eventually quit a week before his death. He left Larry's business swearing, saying how the company was doomed. Larry was not happy and even threatened Steve after this last disagreement. Carmen Colossal: Suspect's prints: Jordan's prints: Jordan's hair (medulla):
short, blonde, solid Larry's prints: Larry's hair (medulla):
short, orange, fragmented Jordan's blood type:
AB+ Larry's blood type:
O- George's prints: George's blood type:
O- George's hair (medulla):
short, brown, fragmented Carmen's prints: Carmen's blood type:
A- Carmen's hair (medulla):
long, brown, continuous Suspect's blood drops: Exhibit B: Suspect's Blood Blood typing tests were performed on the very same blood that was found at the crime scene. Some drops had matched those of Steve Burns' (AB+) which must obviously be ruled out as the suspect's own. But others were found to be O-, this blood type is very rare because it has no antibodies, A or B, and lacks any protection of the Rh gene. This blood type is helpful to the case because it rules out that Carmen Colosal and Jordan Reynolds were at the scene, or at least involved in the altercation. This is evident because neither have O blood type. Coincidentally, George Burns and Larry Hoover both have blood O which means it could be either of their blood that had been spilled on Steve Burns floor on the night of his murder. Exhibit C: Hair Hair is another form of class evidence crucial to the case. Measurements of the medulla, can identify a broad range of suspects which could also eliminate others. The medullary index of the hair, which is the relative size of the the inner core of a strand of hair relative to the whole size, should be roughly the same of all humans. But the actual design of the medulla, which is the pattern, must be consistent with
1 of 5 designs. The medulla could be continuous, interrupted in intervals, fragmented at different intervals, solid with a full pigment, or absent with no separate pigment. The suspect's hair was consistent with that of a fragmented medulla which only occurs in two of the suspects, George Burns and Larry Hoover. This hair most likely belongs to either of these two gentleman which would mean that at least one of them had to be at the scene during the altercation. Suspect's hair: short, fragmented Chain of Custody Chain of custody describes the consistent, documented, and unbroken seal of the evidence's movement from crime scene to the laboratory. This moves from the time it was found, to the time it was collected, to the time it was processed, and to the time it was brought to court. Each officer and laboratory technician that has processed this valuable information from fingerprints, to blood, to hair must follow a certain code that ensures it's ability to be upheld in this court of law. All of the information brought to you today has come from an approved chain of custody and is lawful evidence. Rigor Mortis Rigor mortis is an important piece of evidence in relation to the actual murder because it is the basis of science that shows forensic scientists how long the deceased has been dead for. The normal body temperature of a human is 37 degrees celsius, Steve's body was 30 degrees celsius at the time he was found. Temperature loss = rate x time. The temperature loss is 7 C and the rate is proven to be 0.78 C/hr which makes it easy to find the time. 7 C / (0.78 C/hr) = time in hours or 8.97. Since the body was found at 7 am the death occurred at 10 pm the previous night. This time would indicate that all four suspects don't have justifiable alibis to protect them from the possibility of being the lead suspect. Steve Burns' body Suspect's blood Suspect's hair Suspect's fingerprints Forced entry (backdoor)