Last night the police pulled you over and charged you with driving while intoxicated (DWI). If the court finds you guilty, you could face prison time or community service. You could lose your license or have to drive with an ignition lock. If you are here on a Green Card, you could lose that too, especially if you have other convictions.
One possible defense you could use if you failed the tests is to prove the traffic stop was illegal. You need to show the officers had no valid reason to pull you over in the first place. These are some of the reasons the police may believe someone is drunken driving:
If you were driving well and within the law, you may be able to show the officers did not have cause to pull you over.