There is a company which makes ball-tumbler machines for state lotteries. One security feature it has it that each ball has it's unique RFID tag embedded insid

There is a company which makes ball-tumbler machines for state lotteries. One security feature it has it that each ball has it's unique RFID tag embedded inside, and the machine checks the tag on ball entry, and only allows a ball in if certain conditions are met. And I think that it can use that RFID tag to also read the output (so no CV is needed). Some use a ball set only once, they throw it away after a run and use a new one on each draw, and this RFID mechanism can also enforce that (disallow previously used ids). Even if someone messes with the RFID tags, the (transparent) machine and the output is still visually checked by a commission on each run. Of course, when this information became public knowledge, immediately some conspiracy theory emerged that the RFID tag can be used to allow only "favored" balls to exit the machine as winners (which is not possible, only entry can be disallowed, not exit).