She got very huffy and flat out denied that the blood bank dna was used to identify the murderer. He wans't covicted using that DNA, true, but the identification was no secret.

The police had made 2 arrests of persons they later had to release at that point, so I guess they didn't like to take any chanses with the third.

It should be said that the general opinion outside of medical reserarch was supportive of the police.