Since there are devices which use a camera to visually estimate where a ball will land based on the speed and all, I think this would definitely be possible, but again extremely hard. However, it is hard for them to rig the odds/even bets. Only the number bets are what are unsafe to place as that can be manipulated to an extent.
And how would that possibly work since you can't bet after a ball has been spun?
Have you actually ever played live roulette because that question tells me you have not! I am still piling on the chips in the casino after the ball has spun usually get at least once or twice around the table before the croupier calls last bets. So that is how, I can tell if a croup is trying to place it with my eye by the speed and how many times it goes around before dropping. Anything less than 7 times round is suspicious.