Karen, law school is not like undergrad where you can pick a major like criminal justice and graduate with that specific degree. Upon graduating from law school, you receive a Juris Doctorate. After passing the Bar exam, you are a licensed attorney and authorized to practice law. You can now represent someone in court; limitations apply to certain family law cases and courthouses where more training/certification are required. If you want to be a Criminal lawyer, any undergrad degree is acceptable to gain admission into law schools. In your third year of law school, focus on internship in Criminal law by working with an experienced criminal attorney, working in the DA's office, or taking electives in that practice area. All the best!