Controlled substances get counted twice, and the second one is blind.
The first total is banked and hidden. The tray has to physically empty before the second count starts — Tabulora waits for the camera to see it clear, so a “second count” cannot be the first count confirmed twice. If the two disagree, nothing saves until somebody recounts.
Which fills need this is your pharmacy’s rule, read off the Rx number, so it does not depend on a lookup succeeding.