dr. denise dowd helps write policy for the american academy of pediatrics. she says kid's brains aren't ma sure enough. >> you can teach them, but they should not be in independent control of that weapon. >> reporter: there are 30 to 50 cases abyulely. >> you don't trust your quid 1s00% of the time especially something so high risk. >> how many times does it have to happen before people say it's enough? it's enough for me. i didn't choose to sacrifice my child. we keep a watchful eye on his candles. >> reporter: jody sandoval keeps a memorial for her son. he was just 14 when he and his best friend were playing at his grand parent's house. >> levi found a gun behind the television. he removed the clip and fired a shot. >> reporter: listen as his 14-year-old friend is questioned by police. >> i pulled the trigger and i thought it hit the wall and it hit him. >> reporter: throughout his enter dpainterrogatio interrogation, levi has no idea the shot was fatal. >> do you think we should tell him what happened? i do too. noah didn't make it. he's dead. >> reporter

dr. denise dowd writes policy for american academy of pediatrics.ds' brains aren't mature enough they lack impulse control. >> you can teach them. they can pare it back. they should not be in independent control of the weapon. in her kansas city children's hospital alone there are 30 to 50 cases annually. tragedies she says, that are entirely preventible. >> if you don't trust your kids 100% of the time, especially when it comes to something that is so high risk. >> reporter: back on the range. safety is always a top priority for the sure shots. >> i have to say all of you were very safe. >> reporter: youth training day end with diplomas. it's clear these kids and their parents believe deeply in the right to bear arms at any age. but in light of this latest tragic accident, gun critics wonder at what cost. for "nightline," juju chang, in austin, texas. >> eye-opening. >> very eye-opening. rays a lot of questions. and the age limitation. whether there should be state regulation. whether gun ranges should have a say in who should be allowed to partici