Much is made about people who can be called to testify in court simply because they were present as a witness when police officers are discussing a case. Yet it never seems to occur to Raydor (or to Rusty who is in that very predicament) to ask Kris to leave, since she herself could be called later to testify in a trial.
When Lt. Provenza lists the charges against Lloyd, one of them is "fleeing the scene of a crime." There is no such offense in California.