I have always thought about being a lawyer, but two years ago I was arrested for driving while intoxicated. I pled guilty, my license was suspended, and I was sentenced to six months probation. Does that mean that I should forget about law school?

MT: This does not preclude you from going to law school, though be sure you disclose this information on your law school applications – there is a section provided on most applications for this purpose.

TH: No. This does not mean you should abandon the idea of going to law school, as one DUI will not usually preclude you from going to law school. First, you should contact the bar association in the state in which you would want to be admitted to ask about any limitations for admittance to the moral character portion of the bar. Second, you should contact the law school(s) to which you plan to apply to inquire about their policy regarding admitting students with DUIs. Most law schools ask you to disclose these types of incidents on your admission application. It is important that you respond to these questions fully and honestly.

PB: If this is your only encounter with the law, you should not forget about law school. All law schools will ask about criminal records, and most are primarily concerned about the type of conviction, or how often the person has been in trouble. Make sure you disclose everything to the law school. 
Nearly everyone has done something of which they are not proud, but you can move on and grow from the experience.