Collecting evidence (1)

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Forensic science uses methods which enable police to and solve crimes.

crime scene

Evidence is collected at the crime . There are various ways of collecting evidence.

1. Writing a of the crime
2. Drawing of the scene of the crine
3. Making videos.
4. Taking with a camera.
5. Taking from witnesses.

It is important that the scene of the crime is prevented from becoming . This could hinder or affect the outcome of the investigation. To minimise the contamination of evidence, the police use a number of , such as

1. Restricting to the crime scene
2. Wearing clothing
3. Use appropriate of sampling materials.
4. Use appropriate methods of evidence
5. items found at the scene in sealed packets or containers.

Statements from witnesess are important to analyse and solve the crime. Witnesses could provide evidence about the suspect.

The details used to the suspect could include

1. Whether the suspect is male or female
2. The weight.
3. The height.
4. The of hair.
5. The of the eyes.
6. Details of the worn by the suspect
7. Special distinguishing , such as scars or tatoos.

I is essential that the evidence is valid, accurate and reliable. The evidence needs to be , so that if the evidence was collected again it would be the same. If repeated sampling does not yield the same result from analysis, then the evidence might be considered to be . Important decisions need to be taken when taking samples from a crime scene. When a large quantity of material is available at the scene for sampling then a decision needs to be taken about the of samples to be taken, and whether these samples will provide reliable . Sometimes the outcome of the analysis could depend on whether the material is taken from a material (the same property thoughout the material). To analyse and measure samples in more detail the police would need to use instruments having greater . It is important that instruments are correctly, so that the measurements are accurate. Otherwise errors in the measurements will be introduced. The evidence can be used to identify the suspect, but also to suspects from further police . The evidence, if valid, and reliable, can also be used in a court of law.