The Gauntlet

A hard but mediocre cop is assigned to escort a prostitute into custody from Las Vegas to Phoenix, so that she can testify in a mob trial. But a lot of people are literally betting that they won't make it into town alive.
Phoenix cop Ben Shockley is well on his way to becoming a derelict when he is assigned to transport a witness from Las Vegas. The witness turns out to be a belligerent prostitute with mob ties—and incriminating information regarding a high-ranking figure.