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The joke has always been and totally true, that Amanda and Raffaele would have to hover in bright lighting and be equipped with special
magical glasses that would allow them see and discern their own DNA.
Guilters either do not know that visualization of DNA strands requires microscopy, or they are hoaxers. As for Italian prosecutors and certain Italian judges, they are either ignorant or acting in bad faith when they propose a selective clean-up of DNA or blood traces.
Although DNA strands in chromosomes may have lengths of 10s of millimeters (the largest in humans is 85 mm long), the width of the strand is no more than about 3 nanometers. [Source:
http://en.wikipedia.org/wiki/DNA]. Neither chromosomes nor individual human epithelial or white blood cells are visible without a microscope.
Cleaning up blood stains typically leaves residual hemoglobin from red blood cells in a swirl pattern that can be detected with luminol and TMB. There were
no such patterns detected at the murder scene.