How to get someone do admit they stole something from you?

Make that 2 somethings… I originally lost an iPhone that i had kept in my locker. So i waited about a week and it didn't turn up. I figured it could have dropped out and so i didn't pursue it. My dad offered to get me another because we had an upgrade. So I left that one in my locker (by accident this time) and when I checked at the end of the day it wasn't there! 2 iPhones in two weeks. I have a pretty good idea who might have taken them but I'm not positive. He's taken other peoples phones but always returned them within like 3 days. I've talked to him and he's very suspicious. He has mild autism and the suspiciousness might be a part of the social disorder. Any way I'm trying to get him to admit it. As of now, I have offered to pay him and said that no questions will be asked. Each time he has changed the subject. I'm really frustrated by the whole thing. I have no idea what to do. I really appreciate the actual help. Thanks.

Added (1). My question is how to get proof.

Added (2). Haha sorry to keep adding stuff. But the office has been notified and because i didn't have a lock (which they sell for $5 and you can only use theirs) they are not liable or concerned.

Have proof, then corner them into admitting it. Without proof, it's only an accusation

Waterboarding?

I ddont think school staff will help that much.tell your dad to talk to the your school adivsor or what ever because parents has much influence than u talk to the school staffs

Yea I don't think the school cares

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