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.
By virtue of the meaning of the word âforensicâ, this type of DNA testing pertains to using scientific knowledge to solve crimes. DNA evidence was first used in England in 1985 where a 17 year-old boy was suspected of raping two young women; DNA exonerated the boy, and the real perpetrator was eventually caught.