Smith v. Doe is a court case that happened a long time ago where the government made a rule that people who were convicted of certain crimes had to tell the police where they lived and what they were doing all the time. This rule was called a registry.
Some people did not like this rule because they thought it was not fair. They thought that it was not right for the government to make people tell them what they were doing all the time. Smith and Doe were two of these people who did not like the rule.
They went to court to try to change the rule. They argued that the rule was not fair because it made it hard for them to find jobs and places to live. They also argued that the rule made their lives hard because they could not move around easily because they had to tell the police where they were going.
The court had to decide if the government's rule was fair or not. They said that it was okay for the government to have the registry because it helped keep people safe. They thought that it was important for people to know where convicted criminals were living so they could avoid them if they wanted to.
So, the rule stayed the same and Smith and Doe had to keep telling the police where they were all the time.