I don't think the CLERK's statement of NOT SEEING stains means ANYTHING AT ALL. According to Testimony, evidence, there were OTHER SPOTS on the JACKET LAPEL that were NOT REDDISH BROWN, or didn't show SIMILAR DNA to DANIELLE'S.
Yet, when police got the jacket, 3 stains of apparent blood and another stain of SOME kind, were readily apparent visually to the police evidence technician.
Isn't it obvious that these stains were put on the jacket well after the disappearance of Danielle, and in fact after the jacket was cleaned and returned to DW?