It depends honestly on what county you're in. Right now the law isn't written correctly and won't be re-written until the 2013 legislation session begins. So right now, you're not violating the state law by having your front plate up in your dash. The law states that two plates must be displayed in front and back at all times. The law was re-written after a case in which a man was pulled over for not running a front plate and was found carrying kilos of cocaine. He was let off on a technicality in the law the first time, but stupid criminals don't learn from their mistakes and he was caught a second time and pulled over again on the same probable cause of not running a front plate. This time he was convicted and the judge that did the sentencing demanded the law be ratified.
Here is the information on the law being miss-written: http://www.myfoxdfw.com/dpp/traffic/...ate-law-011112
Here is the story on the guy who got busted and started all these changes: http://www.statesman.com/news/texas-...st-918800.html