it says "Any 2-way messaging device", in my opinion a CB, Amateur Radio both fall under that catergory."(2) "Electronic communication device" shall mean a cell telephone, personal digital assistant, electronic device with mobile data access, laptop computer, pager, broadband personal communication device, 2-way messaging device, electronic game, or portable computing device."
I would say that wording implies a smartphone with a streaming scanner app is not allowed, but an actual scanner is fine.
Where does it mention CB?
To the OP:All hands-free were focused on cellphones and there was a fight to get amateur radios and cb's exempt. so long as you don't progam your scanner while driving you should be fine