I agree greatly with Vene here. If 12-leads and/or echo tests become mandatory, that will automatically cut out a LOT of kids from playing simply from the family economics. Must the kids be tested once? Annually? Since it is mandatory by a public agency, will there be subsidized testing for those that cannot afford it? Who will do the means testing to determine that? While an ECG and/or echo could catch some problems early on, those things won't help those that can't pay, nor will it really help prevent problems later on. Why? You're not going to keep your heart rate down to a non-stressed level, even if you're not an athlete. Could it be that vigorous horizontal activity (say in a bed or back seat of a car) might just get your heart going? Could it be that you experience something really scary and your heart goes racing?
Then suppose that a problem is found that is correctable, say, surgically. Who pays for the procedure now that it has been found by a mandated program?
Personally, I think that doing these studies should be completely upon the request of the family of each athlete. It would be nice to have info by the team physician and/or ATC, but, I feel that money would be far better spent purchasing AED's and having them immediately available during practices and games than purchasing 12-lead machines.
Oh, and what about private sports leagues? Who regulates who plays there? Certainly schools can't... so those kids that can't get the studies done and are prevented from playing in a school-sanctioned sports program can just find a private group and play there. Imagine the lawsuit for being refused to play by a school because the kid can't get a screening done and then the kid suffers a cardiac event during that non-school regulated play and this could have been caught by this mandated but uncompensated screening?
Oh... Yeah, I can go on...