A criminal defense lawyer specializes in representing individuals or companies accused of criminal activity, working either as privately retained attorneys or as court-appointed public defenders for those who cannot afford counsel. In the United States, these lawyers guide clients through every stage of the legal process—from arrest and investigation to trial, sentencing, and appeals—while aiming to minimize harsh consequences. A critical part of their work involves safeguarding constitutional rights, particularly the Fourth Amendment (protection against unlawful searches), the Fifth Amendment (right to remain silent), and the Sixth Amendment (right to counsel, confrontation, and a speedy trial), all of which are applied to states via the Fourteenth Amendment. Early in a case, defense attorneys meticulously review evidence to identify constitutional violations, which can lead to evidence being thrown out and the case dismissed. If no violations exist, they pivot to trial preparation, crafting defenses and comparing proposed plea deals against their best judgment for the client's outcome. Ultimately, the role is a vital check on government power, ensuring every accused person receives zealous and quality legal representation.