Competing models to detect DNA contamination among individuals (<i>k)</i> within a collection (<i>i</i>) across loci (<i>l</i>).

Genotype index is a value assigned the apparent genotype observed during allele scoring. In uncontaminated and contaminated individuals, the probability of observing these apparent genotypes is estimated by Hardy-Weinberg expectations based on a single individual and on two individuals, respectively. See text for description.