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Almost forgot. There are a few U.S. Border Patrol check points on various roads around that part of Texas. They usaually just ask you where you are going to and most people say Big Bend or Davis state Park. They also have drug and bomb dogs sniff your car which is kind of cool but they are very nice officers.

Yes you can carry in National Parks in Texas. My girl and I went on a Texas state park tour all across Texas and went to Big Bend and Guadalupe Mountains National Park. The greatest threat out there is rattle snakes and maybe a slim chance with a mountain lion but I would invest in some snake guards. When we went out there we had a 5 foot rattler come within a few feet of us. They like to come out at sunset. Also, if you have small children keep them out of the tall grass and within your reach. Those rattlers are nasty when you startle them!! Bring a shovel and snake shot as a precaution. Check the parks website and I believe the department of Agricultures website will also touch on this issue. The main thing you have to watch is the Army corps of engineers. Check out their site and make sure you are not going anywhere where they are. Also, you can carry in a National Park but check out the law and make sure it hasn't changed for any reason. Never just take our word. Take a little time to make sure you are familiar with park rules. Enjoy Big Bend!!

PS. Make sure you have a good spare tire and jack. It is a long way to a mechanic out there.