Our shufflers are designed to randomize as much as possible via each pass through. The design allows a level of randomization of one to two cards to be pulled from each side with each shuffle. This helps avoid a “Faro shuffle” (a perfect weave), which is considered insufficient randomization and can be manipulated. So by adding randomization of 1-2 cards pulled from each side for each pull, it prevents deck manipulation and helps with correct overall randomization of cards.
That said, it is recommended to run a deck through the shuffler multiple times to sufficiently randomize the cards. A single pass through the shuffler would be the equivalent to a single riffle shuffler or side shuffle.
It is not known if our shufflers would be allowed in any competitive-level event. Please check with your local tournament organizer.