Advises clients about the potential consequences of a course of action
A criminal lawyer helps their client understand criminal laws. They also help the client understand how their actions may or may not violate a criminal law. A defense attorney might help their client understand whether a proposed course of action is a crime. An attorney for the state might help law enforcement officers understand best practices for enforcing the law.
Helps their client present their case or present a defense
A prosecutor or district attorney presents evidence and pursues prosecution of cases on behalf of the unit of government that they represent. They make decisions about whether to extend a plea offer. They present the evidence on behalf of the state at trial. A defense attorney helps their client present a defense. A defense attorney gathers evidence for their client. They evaluate the case in order to determine viable defenses. If they need to file pretrial motions, they make sure they file the motions in the right way.
Protects their client’s constitutional rights
Citizens have constitutional rights. No unit of government can pass a law that violates a person’s right to be free from an unreasonable search and seizure. Law enforcement also can’t keep a person in jail for an indefinite period of time. Criminal attorneys must know how the constitution and criminal law intersect. They must be aware of constitutional implications of law as they go about their work and advocate for their clients as necessary in order to protect and defend their constitutional rights.