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Body fluid
& DNA
evidence.

The analysis of deoxyribonucleic acid, otherwise known as DNA, has become the epitome of scientific proof during legal proceedings. It is instrumental in the outcome of a diverse range of cases, from murder to sexual offences and robbery.

DNA provides biological truth

DNA evidence has both acquitted and convicted many defendants; and advancing techniques have made it highly advisable to obtain a critical third-party view, especially when a case hinges on mixed DNA or very small amounts of DNA.

Here at Aequitas Expert Witness Services Ltd, our in-house specialist has over a decade of experience and provides a robust expert witness service, which has been called upon in numerous high-profile cases.

Extensive range of DNA techniques

Our expertise includes the full range of human body fluids and tissues which can be transferred between people or objects, such as clothing or weapons. We commonly evaluate evidence for cases relating to burglary, sexual offences and murder, among many other matters.

As well as routine tests, our scientists can apply specialist forensic DNA techniques such as low template, Y-STR, mitochondrial and animal – even if resultant profiles are small, mixed or degraded.

Our other services include paternity testing and supplementary DNA testing, carried out to ISO 17025 quality standards.

Lubricant evidence in sex cases

The presence of lubricants such as oils, emollients and other man-made products have often been used to support cases involving rape or sexual assault, usually when discovered in intimate samples or on items of clothing.

Why is the presence of lubricants potentially significant?

Intimate swabs can reveal traces of substances as diverse as grease and sun protection cream – but also PDMS, a siloxane-based oil found on the exterior of condoms, which may suggest contact between specific parties.

Why obtain analysis?

Lubricant evidence is a highly contentious matter and some public laboratories choose not to undertake its detection and interpretation, meaning that vital information may be missed.

For example, if one side of a case states a lubricant or a product coated with a lubricant was present, while the other states it wasn’t, detection would support the former’s version of events.

Lubricant evidence can also be found as the result of contamination, including during sampling, so careful analysis is essential.


To find out more or ask advice, please don’t hesitate to contact us. There’s no obligation to proceed with our services – just tell us what you need and we’ll do our very best to advise you.