I don't have time for a lengthy post, but I wanted to mention a problem in the analysis of DNA mixtures, namely that of a "suspect-centered analysis." Although it seems counterintuitive, one should not begin an analysis of a mixture with the suspect's DNA reference profile in hand. Although I do not believe that the host of the blog Maundy Gregory is an expert in DNA profiling, his
exercise concerning the bra clasp illustrates one problem with suspect-centered analyses: He demonstrates that it is possible to find Casey Anthony's DNA on the clasp. Another problem in the interpretation of DNA mixtures are addressed in this
introduction to the topic. A more advanced discussion can be found
here.