While it is true that all you need to do to enable the TV when driving is plug it in a different outlet.
MPHY, Don't count on that officer taking you up on your offer.. (He might, or he might not)
Though I have never, personally, seen a ticket for TV WHERE DRIVER CAN SEE IT.. I did, once or twice, provide the chapter and verse (Section and sub-section of law) to the Law Enforcement Officer writing said ticket, so I know they have been written (That used to be my job don't you know, yup, i get paid cause I told cops where to go)