A PCR is as you state - it amplifies genetic material present. They can look for specific genetic fragments in that process. A particular sequence does not have to be large. A PCR in no way should be used to diagnose disease. That is a clinical diagnosis. The PCR can only show what is there many times amplified. Therefore, if they are looking for particular fragments of a specific gene sequence, they can use a PCR to help detect the possible presence of that sequence. Agribusiness uses PCR methods for localizing gene expression in plant tissue. That is how they can sue farmers over their patent protected property. They own the patent on those sequences. Evil bastards. What is really crazy is in the pipeline there are developments using optogenetics to detect those gene sequences using scanners. They won't need a PCR. Someone is currently developing a system for pot. The legal plant will have its own barcode that can detect all the vital information associated with the plant. They want to identify and track every living thing on the planet.

Yes, we must still continue to wake people up about the dangers of all manner of poisonings - especially vaxxines. And yes, more pain is coming from what has already been done.