The real nightmare is that we might be right around the corner from DNA being writable to the extent that you could make mock DNA to plant at a crime-scene/evidence-locker, and there might be a couple awkward decades where the courts believe the FBI when they claim to have found DNA matches (just like that time they systematically pretended they could identify hairs, and convicted people of murder based on hairs that were literally from dogs in some cases). We'll catch on eventually if they try it, but it would suck for those of us convicted on falsified evidence. I wouldn't be so paranoid about that possibility if they hadn't lied about the dog hairs for decades.