Spitoon, ATM is not used to validate and verify. It has a whole load of uses including checking that correct callsign appears after dep, observing that it is following correct route, being able to see order of a/c on final approach, judging approach spacing to decide on lining up a/c etc . . . . I'm no longer an aero atco so I forget the rest. I'm sure some kind soul will quickly list them. But, atm is not a radar and cannot bed used as such.