> parallel counts by each candidate I have often imagined having say two scanners in physical sequence (so passing through a ballet is a single operation), and

> parallel counts by each candidate I have often imagined having say two scanners in physical sequence (so passing through a ballet is a single operation), and having more than one (competing) recorder for the output of each scanner head. This would require some standardization of form factors and interfaces, but with small enough electronics units and scanners, in principle parallel data paths could be included in a single intentional "infrastructure".