This is the second time today I have heard horror stories abiout TX cops.
Unfortunately, the cops in your area need to be broiught back down to reality and the law. Unfortunately, you and some friends might have to work at it a little. First, you should look into wether TX is a one party or two party recording state. Then, in accordance with the law, record the conversation when you get stopped.
Ask to see the radar gun. If he refuses, ask why. If he says it is dangerous, ask him to state WHY it is dangerous. I would do all I could when I get pulled over to make the stop as safe as possoble. Pull into a parking lot where there is little chance of getting hit by a car. If he still refuses, ask the officer, who is out of his car anyway, when he comes over to get your license and registration, ask him to take your camera and snap a picture of the radar gun, this way he doesn't have to make an extra trip back to your car. You can even tell him that you will provide him a copy of the picture, to use as evidence AGAINST you if the picture shows a number above the speed limit. Of course, if you are safely parked in a parking lot that should not be an issue. If he refuses, like I said, ask him to state why it is not possible to take a picture of the gun if you give him the camera. . There aslo is probably a state law that says he has to show it to you, which might help you fight the ticket if he refuses all your attempts to get a picture/see the radar gun. You should look into the laws in your state.
Try to somehow indicate where you stopped. This might actually mean subpaena-ing the recording of the 2 way communications recording, or perhaps the officers body microphone ( in LA, all traffic officers record the conversation you have with them when they pull you over). If you must, take a picture of the officers car behind your, with an address or street sign, or cross street in the background, then do so. You may need to get a bunch of your friends to do this also when they get stopped. You need this to prove that the area was safe for you to see the radar unit, and if he refused, that there must be some reason why he didn't want you to see it.
The more they lose, the less likely they will issue bogus tickets. Also, if you collect some good evidence, you can go to the local newspaper or TV to do a story. Also, illegal car stops are a violation of you civil rights. Done enough times, and with enough proof, you can file a suite against the police shief and the town for violating your rights. There are rich organi*tions which might help you with that. Also, the FBI (and maybe even the TX rangers) will investigate these abuses.
Try not to act defensless. You need to learn your rights, and do what you can to protect them.