With a hair sample, we can make a breakdown of the amount of alcohol and drugs month by month. Our samplers are fully trained to collect DNA swabs for paternity, relationship and identification testing. We specialize in the extraction and processing of DNA from the deceased Many other forensic samples can be collected and processed. WJ Legal Services Limited is a national company that provides forensic samplers trained to collect samples for legal/litigation and retail clients. All our employees are fully trained in collecting DNA, hair, blood and other bodily fluids.