How about "labs are fallible"? I think the point is, while forensic "science" are still using lie detectors and other very questionable techniques that just can

How about "labs are fallible"? I think the point is, while forensic "science" are still using lie detectors and other very questionable techniques that just can not work reliably, it's a bit strange to paint DNA itself as fallible. DNA can work, if the lab is competent. Lie detectors and other voodoo can not.