Im not sure if different strains would carry a different dna signature or not, but as far as beekeeper liability is concerned, I dont think it would be a real far stretch for an attorney to make on a civil suit. It wouldnt be a criminal suit where one would have to have a smoking gun fora conviction. A bee sting civil suit would be held to 'preponderance of the evidence' where dna probably wouldnt even come into play after a picture of the neighbors hives was produced. Let alone some good bearding pics or swarm in the neighbors apple tree. Not a frightful thing to beeks, but to a ticked off neighbor and a retained lawyer,they may speak volumes.