Hackers set free or just lag?

So lately on matches, there has been alot of weird kills that come up on the Replay as way off shot. Sometimes, the sight even goes red before im in vision. Sounds like an aimbot, but there has been talk of server issues, or just lag in general. However, there is an aimbot available for Halo 4, and has been for a while before the games actual release, but, i dont want to believe that they are running around online. Im assuming 343 already knows about the aimbot, and is working to fix it, but, still. Is anybody else encountering these problems or have any conformation on each side?