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.
How DNA Evidence Works. The advent of DNA (deoxyribonucleic acid) evidence is one of the best examples of how much technology has altered the criminal justice landscape, particularly its use exhonerating the falsely convicted. DNA evidence technically doesn't pinpoint a single suspect, but rather narrows it down to just a few possibilities within the human population.