Yep, Missouri requires front plates and Kansas (and many others) do not. I doubt that the Texas HP keeps tabs on which states do and don't have front plates and can't imagine they would ticket you for it. I believe that
all states surrounding Texas require only rear plates (Arkansas, Oklahoma, New Mexico, & Louisiana) - can you imagine them pulling them all over? Not a chance.
HOWEVER, I
have been reading up on the "obscured plate" law in Texas that was passed this last fall and my novice interpretation is that they can indeed pull you over for that regardless of what state you are from. It reads, in part: "SECTION 2. Subsection (a), Section 502.409, Transportation Code, is amended to read as follows:
(a) A person commits an offense if the person attaches to or displays on a motor vehicle a number plate or registration insignia that: (snip) (6) has an attached illuminated device or [is a] sticker, decal, emblem, or other insignia that is not authorized by law and
that interferes with the readability of the letters or numbers on the plate or the name of the state in which the vehicle is registered."
Note that last sentence that seems to cover any and all vehicles from any state. The law was designed to kill off the neon frames, as well as the "diffuser" covers that screw up laser and photo radar. If you have ANY cover over your plates, even clear, they can pull you over and fine you $200. But that's not all! It also covers simple license plate frames, which MANY of us have on our Vipers. If the frame covers part or all of the state name in which it was issued (Kansas, Alaska, whatever), then they can ticket you for that as well. You can
read the actual Texas state bill here.
Bottom line: I wouldn't worry about the front plates if you are out of state, especially where they are not required originally (Kansas, etc.). However, as the most overzealous law enforcement on this new law seems to be in Dallas and San Antonio, I would recommend you think twice about that plastic cover or that awesome frame that covers up your state name and/or other lettering. Everybody knows that some cops (but definitely not all) just look for any excuse to pull over a sports or exotic car. Don't give them this one.
PS. Note to all Texas troopers. I will be driving a red Corvette with Hawaii license plates...