1. A typical drink-drive case will be a post-driving drinks defence or a laced drinks special reasons plea involving calculations using the Widmark equation to establish whether or not the extra alcohol has been responsible for the motorist producing a breath, blood alcohol value in excess of the legal limit.
Similar calculations are used involving metabolic rates for alcohol with respect to alleged offences of motorists being 'in charge' of a motor vehicle with a breath alcohol level in excess of the legal limit. Back calculations relating to road accidents and assaults are also carried out. Validity of failure to provide samples are also dealt with.
2. Drugs cases may be concerned with checking the nature and quality of drugs found in an individual's possession and of establishing whether or not a person was under the influence of drugs at a time when an alleged crime was committed but was not responsible for making decisions at that time. The significance of prescribed and (new word but cant read the client's handwriting) drugs in driving and accident cases are assessed.
3. Checking DNA results and interpretations arises in assault, rape and sexual abuse cases and even in some drug cases.
4. Some crimes involve assaults from the use of dangerous chemicals. In these instances, analysis, knowledge and experience of the chemicals is necessary. A similar situation arises with industrial injuries arising from chemically polluted atmospheres.
5. The examination of chemical and biological goods which have deteriorated during transportation by ship, lorry or airplane usually involves in-site examination of the items themselves and the location within the vessel to establish contributing factors arising from exposure or to other substances being transported.
6. A typical burglary may lead to detailed studies with interpretation of footprints from the location, analysis of fibres of clothing left behind and analyses of glass particles on clothing from someone allegedly involved with the crime.