When the female csi is interrogating woo she tells him of an fbi investigation. Legally she was not supposed to tell him he might be the one they are looking at. Since she did the fbi would be forced to completely stop their case on any suspects because of the possibility of him telling the other guards and having the guard they are looking at stop what they are doing.
When db and nick enter the jail it is bright daylight out behind them but a few seconds later when they get the time of death the corner says he has been dead for 3 hours. A female csi says so 7pm meaning it is 10 pm when they show up. Even in vegas even in the summer by 10pm it is dark out and not bright sunlight.