Thats what I was thinking. The motivation I suspect is that the new face of war is biological. So the federal government ostensibly wants the power to 'covertly vaccinate against bioweapons or potential bioweapons made by, and stolen from, foreign states.' I saw a conspiracy theory years ago that the anti vaccination movement was pushed on the right, so only the left would be innoculated when another state or the federal government, released something to wipe out the u.s. Makes for an easily domesticated and neutered population. The people that survive would be gullible and a lot less likely to fight back.