Provided is a method for determining the presence or absence of an individual's DNA in a sample containing DNA from two or more contributors. A panel of a plurality of single nucleotide polymorphisms (SNPs) is used. For each SNP in the panel, it is determined whether the minor allele of the SNP is present in the sample, and whether the minor allele is present in the individual's DNA. If the number of minor alleles that are present in the individual's DNA that are also present in the DNA sample is above a predetermined threshold, the individual's DNA is concluded to be present in the sample. Also provided is an array of DNA molecules for use in the method, as well as a method for estimating the number of individuals contributing to a DNA containing sample.