This writing assignment contains the following information based on the criminal justice system. The following topics will be explained as follows: The importance of circumstantial evidence and direct evidence in order to support the truth. Second, the essential use of aerial photography at a crime scene. Third, the importance of the Locard exchange principle when entering a crime scene. Additionally, three different chapter topics will tie into an ongoing criminal investigation event. During the second week of class, Professor Gonis demonstrated the difference between circumstantial and direct evidence. Mr. Gonis showed the students an example of circumstantial evidence by leaving the classroom and knocking on the door three times in a row. The professor came back inside and touched his forehead with his left hand. Then, students were asked to give facts and opinions about what they saw and inferences to support their argument. Circumstantial evidence is defined as evidence that relies on an inference to relate it to a conclusion of fact. (79) Miller, Marilyn T states: “An example of this would be showing a receipt for a knife the defendant purchased and assuming that the same person committed a crime with that knife. This does not necessarily mean that the person used this type of weapon to attack the victim. » Direct evidence used in a trial is considered true, the accusation against the accused is established. The claim that the defendant committed the crime charged can be proven only by direct evidence, if the jury finds the evidence to be reliable. http://www.probablecause.org/index.html. An example of direct evidence would be having physical evidence of the crime and documentary evidence... middle of paper ...... the apter describes the crime scene. In Chapter 3, under the topic Matching Physical Evidence to Known Standards, explains: “Forensic science includes the deification of physical evidence and the discovery of its origin. This individualization of evidence often requires that the physical evidence collected at a crime scene meet a known standard of proof or control. (52) Mather Kate and Winton Richard reported in a Los Angeles Times article: "Gabriel Campos-Martinez, 36, is accused of killing his boyfriend and disposing of his severed head, hands and feet under the Hollywood sign. Gabriel was charged with murder. If convicted, he faces 25 years in prison. Dist. deputy. Atty Bobby Grace said: "The body parts were enough to say that Medellin was killed after he disappeared shortly after Christmas 2011. Medellin's eyes showed "classic signs of strangulation »..”