1. A method for setting a threshold in a biometric system using imposter match score data to derive a match threshold score that results in a desired false match rate and false non-match rate comprising: creating a database of match scores between all unique impostor biometric sample pairs; creating a cumulative histogram data table recording for each possible match score outcome a number of match scores observed greater than the threshold divided by the total number of samples; and selecting a desired false match rate and applying the threshold that will result in the desired false match rate.