Certain people are more at risk of going missing than others, possibly because of their situation (for example children in care) or medical issues (for example people with dementia or some people with mental health issues).
People who have gone missing before may be at risk of going missing again, especially if the issues which led to them going missing before have not been resolved.
This does not mean that every child in care, everyone with dementia or everyone who has gone missing before will go missing. But it makes sense to plan ahead to try to stop people going missing, and gathering information about the person ahead of time so you can quickly give it to us if they go missing.
Other vulnerable people
Even if you decided not to report it to the police at the time, people who have gone missing before might be at risk of going missing again.
Or someone who has never gone missing before might be at risk, for example if they have talked about going missing.