There are many effective defenses to a Tarrant County DWI. Some are based on legal caselaw, others involve the science of the Breathalyzer test, and others use the facts of the case.
The state often sponsors billboards and other ads which claim that a first-time DWI costs $17,000. That claim is not exactly true, but it is not exactly false either. $17k is a fairly good average figure for both the direct and indirect consequences of DWIs, but it is only a very rough average.
It's happened more than once. After being pulled over for a DWI, the suspect tosses the keys aside and then consumes as much alcohol as possible.
The fines, probation, and other direct consequences of a DWI are bad enough. The collateral consequences, like license suspension and higher insurance rates, can be even worse. There's not much that a lawyer can do about the cost of auto insurance. But there is a lot an attorney can do to protect your license. Aggressive representation at the Administrative License Revocation hearing is part of that process.
Prosecutors are very aggressive when it comes to DWIs. In some jurisdictions, as many as half the probationers were convicted of misdemeanor DWI. Truth be told, many of these cases are difficult to defend.