I am reminded of a German police hunt for a ‘phantom-killer’ who’d killed one police female and was connected to around 20 different murders around Germany (around 20 years ago). The one physical description put out...the killer was a teenage female. All of the 20-odd dead were connected by the same DNA situation at the scene.
Eventually, a new team was brought in (thousands of hours already spent in pursuing this killer). New detective looks at everything...then pulls out a blank (new) DNA kit and sends it to the lab. Comes back...’phantom-killer’. Lab got excited.
Nothing makes sense. Couple of detectives go to the company making the DNA swabs and says they get them from a factory in Austria. Detectives go there...hot day...folks busy in the small factory. ‘Boss’ doesn’t know nothing about the DNA swabs....he just makes x-type swabs and sells them in a box of 10,000. Detectives note several big thick-armed Austrian women...sweaty from the heat carrying around the bundles of the plain swabs. Obviously, swabs were contaminated.
Whole ‘phantom-killer’ search shut down. Never was a ‘phantom-killer’. Each a separate murder by itself and the DNA was contaminated.
I look at this Ramsey case...lot of poor police work done in the first hours (maybe accidental), and think the DNA path is a joke.