research into the treatment of a crime scene.

After a crime has occurred investigators will identify the main area of investigation, which could be the area in which the crime occurred or a personal space belonging to a victim or suspect that the investigators deem worthy if investigation. They tend to investigate areas which will contain physical evidence that will help them to progress in the investigation. Once the area has been investigated, the investigators will ensure that they clear the scene of any safety hazards to ensure that the investigation runs smoothly. Once the crime scene has been identified and cleared, there must be security on scene so that the crime scene is not tampered with. In order to make sure of this, the scene will be taped off, indicating that this area should not be entered. 

Before the investigators begin handling the crime scene, they must develop a theory as to what offence they believe has taken place. This also involves holding interviews with people who may have information valuable to the investigation. They will then begin carefully collecting evidence taking into account a range of factors. These include the time of day at which the crime occurred, the weather at the time and more. Investigators will then decide which pieces of evidence should be focussed on. After this, pieces of evidence or deposited into plastic bags along with a description of the evidence. The conditions of the crime scene will also be recorded. For example, the positioning of furniture, the smell and temperature of the area. This should be done after collecting all of the significant evidence to ensure that this process does not disrupt the evidence. 

 Once the initial sweep through has taken place, the area is ready for investigation and the crime scene investigation will begin a more in-depth investigation of the area. Further photos are taken along with video footage and in some cases a 3D scanner may also be used. For some crimes, sketches and diagrams are formed to aid the investigation. Investigators must take care when handling and packaging evidence, particularly if it is biological evidence. A second survey of the area is then undertaken in order to check the area for evidence. A record of all the evidence collected is recorded along with descriptions of all the evidence. 

Evidence found at the crime scene is investigated first at a test known as a presumptive test which indicates what sort of substance it is. This helps to build an image of what took place at the crime scene, as well as who might have been responsible. It also helps to show which pieces of evidence are most significant. These pieces of evidence will then be sent off to a lab to undergo further testing. 

In our opening sequence, in order for the man's plan to succeed, it needs to seem as if the woman has died of natural causes. Therefore, the man must wear gloves in order to leave no trace of DNA at the scene, as well as disposing of all the materials used to commit the crime. 

For this research I used the following websites: 

http://www.forensicsciencesimplified.org/csi/how.html