A lot. A knowledgeable Houston DWI attorney can assist you in being released from jail by arranging for or posting bond if you’ve been arrested.
Also, it should be noted that all persons arrested for DWI who have taken the police breath or blood test, and even a few who have not, have a statutory and/or due process constitutional right to a second independent blood test by their doctor if performed within 2 hours of the arrest.
An experienced Texas DWI lawyer can arrange for this type of testing.