The coach would not put an athlete in the system, nor would the athlete themself. I think there could be an "ID day" or something of the sort over the summer before the start of the season. At specific locations, forms, photos and anything else needing to accompany the ID for verification could be taken at that time. The athlete would need their own birth certificate and another photo ID to even get a card (school id, drivers license, etc.) unless they are too young for that (~4-6 year olds or younger). Coaches and athletes should have NO access to the system at all whatsoever other than at competitions when checking in and swiping cards. In fact, the card wouldn't even need to be specific to a team, though it could be listed on a profile and changed if necessary if you move gyms. If you list the wrong age/team/whatever on your card, you're going to lose out. A specific number of kids should be taken to the warmup area and no more than that. So if you bring the wrong kid on purpose and it's flagged, well that's your loss.. you either get minimal time to get the correct athlete, compete with one less, get a deduction, etc (whatever the penalty may be). To be even more sure about this with the "number" thing going on, as athletes come off the mat from competing, they could be asked their number to cross reference with the list of girls in the warm-up area. That's kind of extreme though..