The original Intoxicated Persons Act 1979 in NSW has been repealed. Police powers to detain and care for intoxicated people in public places are now governed by Section 206 of the Law Enforcement (Powers and Responsibilities) Act 2002 (LEPRA). Under this law, officers can detain a drunk person in public if they are disorderly, at risk of injury or damage, or need physical protection.
However, there is no offence. The detention is meant to be a means of protecting the intoxicated person. Such a person could be taken to a police station and held until sober then released. They could be taken to a hospital, but hospitals never had the staff or facilities to care for drunks. In a small town, or if the person lived near, they could be taken home and handed into the care of a responsible adult.