What is the purpose of calculating random match probability in identifications?

• A. To guarantee 100% certainty
• B. To measure the time since death
• C. To replace DNA analysis
• D. To quantify the likelihood that a match occurred by chance, guiding the strength of the conclusion

Answer: (B)

Random match probability is the estimated chance that a given genetic match could occur by random chance in the population. It uses allele frequency data from reference populations and the observed profile to produce a numeric value. This number helps describe how strong a match is: a very small probability means it’s unlikely that the same profile would appear by coincidence, so the identification carries greater evidential weight. Conversely, a higher probability signals that the match could plausibly arise by chance, weakening the strength of the identification. It does not guarantee certainty, it does not measure time since death, and it does not replace DNA analysis. Instead, it provides a quantitative measure of how likely the observed match is to be coincidental, guiding how confidently the identification should be presented.