Reminds me of a scene in The Town - they were going to rob a bank, and they collected whole bags of hair from a barbershop floor, and spread it during the robbery.
They may be able to pinpoint a location - the barber where all the DNA matches go to have a haircut, and a time - soon after all those with majority DNA in the pile of hair went to the Barber's. Then they can analyse who was in the area around the time and find a person involved.
My thoughts exactly. The only true way is to appear to have never been there forensically, leave no sort of evidence. Security through obscurity only works in some instances.
There was a murder in Nebraska where crime scene was liberally cleaned with bleach to obliterate DNA evidence. Still no conviction despite a lot of circumstantial evidence. This was partially compounded by older DNA technology that destroyed the sample while processing it.
For PCR you only need a super-tiny bit, then you can amplify it as much as you want. I guess you're still technically destroying that tiny bit, but it hardly makes a difference when you only need a few molecules.
That wouldn't actually do anything for DNA, cut hair doesn't actually contain any DNA at all the only way to get DNA from hair is if the follicle is still attached which wouldn't be true generally in a barber shop.
They may be able to pinpoint a location - the barber where all the DNA matches go to have a haircut, and a time - soon after all those with majority DNA in the pile of hair went to the Barber's. Then they can analyse who was in the area around the time and find a person involved.