In DNA profiling, which statement best describes the 'random match probability' concept?

In DNA profiling, which statement best describes the 'random match probability' concept?

• A. It is the probability that a random person would have the same DNA profile.
• B. It is the probability that an analyst would misread a result.
• C. It is the probability that contamination occurred during testing.
• D. It is the probability that a match can be claimed with 100% certainty.

Answer: (A)

Random match probability is the chance that a person chosen at random from the population would have the same DNA profile as the one observed in the evidence. It uses population allele frequencies across the tested loci, and by combining those frequencies, it estimates how common that exact profile would be in the population. A small probability means the profile is rare, so a match between the evidence and a suspect is strong support because it would be unlikely for someone else to share that exact profile by chance. It does not involve analyst error, contamination, or claim 100% certainty; even with a very low probability, there’s always some residual possibility of a coincidental match or error.