I just signed son up for a tournament where the registration system cross-referenced the birthdate with the U.S. Lacrosse database based on the number. (I had typed in 2/21 instead of 2/12 and it kicked me out until I fixed.) Pretty nifty. I doubt many parents used a fake birthdate when they signed up for U.S. Lacrosse in the first place and, regardless, let U.S. Lacrosse require proof of birth once and let tournaments rely on that. | 
