As Michael S. Ratkiewicz (notice the first three letters of his last name?) told me, under Nebraska's "at will employment", the company doesn't need a reason to fire, terminate at will or release a driver. On the side of that though, as an "at will" employer state, the driver can terminate their employment relationship with K & B Transportation at will as well. There isn't any notice required. Hey K & B, you can't have it all your way.
As to the DAC report, just as credit reports are required to be accurate, so do reporting companies like DAC. If K & B put false information on your DAC report, thereby barring you from employment in your chosen line of work, then you should consult an attorney and bring a civil action against them. At the very least, you should contact your state's Attorney General's office and tell them what happened, along with your elected officials.