I think the law says you can't drive in any lane other than the right lane at a speed slower than the normal flow of traffic. If I'm in the far left lane doing 78mph and a BMW comes up on my tail flashing headlights then I'll move over when I can do it without using my brakes. This ain't the autobahn.
Left lane hogging seems to have blossomed into a huge phenomenon here in Dallas area. Especially on the interstates. People are not only distracted behind the wheel, they're downright oblivious...T