Cops and pseudoscience go together like chocolate and peanut butter.

For more examples, see "bite mark analysis," "911 call analysis," "blood spatter analysis," roadside drug testing with known false-positives, and even fingerprints (once the gold standard) have up to a 20% error rate.

And that's not even getting into how their methodology is exactly backwards: they have a claim that they set out to prove, but do no work to disprove what they already believe.