It really isn’t that difficult to avoid cross-contamination. As someone who has done literally 10s of thousand of PCR reactions (probably 100s of thousands) you

It really isn’t that difficult to avoid cross-contamination. As someone who has done literally 10s of thousand of PCR reactions (probably 100s of thousands) you just need to do your extraction and set-up seperate from where you run the reactions. The real problem seems to be the kit-cowboys who have no idea how to do anything unless it comes out of a kit.