Why are pus cells found in stool? A: Pus cells are commonly found in healthy stool, and they help to ease the passage of stool, according to About Health. However, these pus cells are not visible to the human eye. If pus, or mucus, is visible in the stool, this can indicate the presence of a disease or condition. Continue Reading.
DNA evidence is analyzed using the polymerase chain reaction (PCR) method, which allows for very small samples to be tested and identified. Once the sample is tested, it may be cross-referenced with DNA profiles already in a database or with genetic data provided by a suspect.
DNA Evidence: A Brief History. The science of DNA testing was developed in 1985 by British scientist Alec Jeffreys. Genetic evidence was first tested using his method one year later to solve a double homicide in England and to link the suspect to other previously unsolved rapes and murders in the area.