Knight Transportation was sanctioned by the Federal District Court in Texas for the destruction of evidence, called spoliation in legal circles. This happens frequently in trucking cases after accidents, and is major reason why you should hire a lawyer as soon after a wreck as you can find an experienced tractor trailer lawyer (See my prior blogs on how to hire a good trucking lawyer here).
The case, whose opinion was issued Feb 22, 2011, may be found here (2011 WL 734282 (N.D.Tex.)). The court stated:
[T]he evidence is clear and convincing that [Knight Transportation], purposefully, over a sustained period of time, engaged in a concerted effort to hide and destroy evidence.