Scanners aren't illegal in any State, the question I guess you mean in what States is it illegal to have a scanner in a vehicle. This link isn't considered to be good by many but it gives you an idea
http://www.afn.org/~afn09444/scanlaws/scanner5.html
Not sure I understand the second part of it, on some radios you can mix trunked systems with conventional ones, but it's best really to keep the trunked frequencies together, on EDACS and LTR system the frequencies musr be in LCN order. It really makes no sense to alternate the frequencies. Some States have an exemption in the law for licensed Amateur Operators, Federal law says a State can't make it illegal for licensed Amateurs to have Amateur transceivers in their vehicles that are capable of receiving public safety frequencies, it doesn't actually cover scanners.