When we scan an ID, does Passage Point have a setting that will match previously scanned ID’s so we don’t have to keep them all?

Use the intellihint feature for this:  in the Rapid Reg, when a user types in first, then parts of the last name, PassagePoint will present any matching past visit.

Select the correct past visit and PassagePoint will then pre-fill the visitors info from the last visit. This is reusing a previous visitor's info to re-register a visitor.