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16 Cards in this Set
- Front
- Back
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What is the role of a forensic chemist in a back yard drug lab? |
Collect and analyse drug samples, identify the method of manufacture. |
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What is the role of a forensic chemist in a posioning? |
Analyse blood, body tissue for the presence of poison, identify the type of poison and analyse food, water and medicine samples to see how the poison was administered. |
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What is the role of a forensic chemist in an arson case? |
Analyse fire debris for the presence of an accelerant and to determine the type of accelerant. |
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What is the role of a forensic chemist in a hit and run accident? |
Analyse paint chips left on the body and those from the suspect car as well as analyse hair and fibre. |
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What is the role of a forensic chemist in a false labelling charge against a processed food manufacturer? |
Analyse food sample to determine its composition and compare this with the label. |
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What is Chain of Custody? |
Chain of custody is the sequence in which evidence is handled. - Minimum number of handlers. - Ideally 2 people (one collects and delivers and the other analyses) - Must be a witness to all handling. - Detailed documentation. - All people involved must be prepared to testify. |
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What happens of the Chain of Custody is not maintained? |
If a proper COC is not maintained there is no guarantee that the samples tested are the same as those collected at the crime scene. Therefore this evidence will be excluded from supporting the prosecution case and criminal charges may be dropped. |
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Suggest why offenders may be offered their own identical sealed samples. |
This allows for the person being tested to organise their own analysis should they disagree with the official results. It is also one safeguard for ensuring the legitness of the sample being analysed. |
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How do you find the percentage of water? |
Initial - Final Ans / Initial x 100 |
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How do you calculate the drying in rate? |
Change in mass / time (to dry) |
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Inorganic Evidence types? |
-Glass -Paints -Soil |
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What are the three components that make up paint samples? |
-Solvent -Binder or carrier -Pigment |
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Outline the steps used to identify paint samples: |
Paint samples actually contain different pigements. 1. Examine layering sequence of different colours or finish types. 2. Identification of binder and pigments |
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What is Chromatography? |
Chromatography is the name given to a group if techniques used to separate substances based upon their differential distribution between 2 phases (moving and stationary) Separation occurs due to the different strengths of attachment to the filter paper and different solubilities in the solvent. |
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What are the two properties used in comparing glass samples? |
Density and refractive index |
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What does BAC mean? |
Blood Alcohol Content |
