As one of 4.0 revolution technologies, artificial intelligence or AI has been used in various areas, including legal, to help humans do cognitive tasks. It brings out the authors' attention to examine the use of AI in legal areas and how AI works has to be regulated. Then, the development of AI in China, the United States, and Indonesia are subject of the author's examination. The study uses a normative legal research method with a legal, conceptual and comparative approach. Later on, the study finds out that the implementation of AI in legal has been used both in the private and public sectors, including judiciary systems. The type of AI used in legal fields is a machine and deep learning, big data exchange, optical character or facial recognition, and robotic process automation. It concludes that most of AI applications in private sectors are used as platforms to analyze or make documents, provide portal information, and consult or find the right lawyer. Meanwhile, most of the AI application in the public sector is used for digitalizing the administration process, evidence and documents, portal information and recidivism systems for judge's consideration of defendants. In the judiciary system, AI has helped minimized judges' bias to reach fairness and improve time and cost efficiency. However, the regulation shall be existed to reduce the risks that may arise, provide legal protection for its users, and avoid the development of AI that can harm the public. 

Keywords

Artificial Intelligence, Law, Legal Fields