The presence of blood, semen, saliva or vaginal secretions is often significant across a range of case types, predominantly sexual offences, murder, violent crimes, robbery, burglary, possession of drugs and firearms. As well as the body fluids named above, cellular material deposited by touch or contact has also become increasingly important given the high sensitivity of current DNA profiling methods which are key in identifying from whom biological materials may have originated. Urine and faeces are rarely encountered as a relevant evidence type, and establishing the possible source of these by DNA profiling is often difficult
When our experts undertake defence work to review cases, they will scrutinise the reliability of the tests used to identify staining as a particular body fluid, assess the amounts present and consider whether the distribution or pattern of staining is significant.
Our experts were involved in the development and validation of many of the methods used today so have intimate and extensive knowledge of the strengths and weaknesses of the techniques used.