I think it's a good idea, with set rules, because everything is going electronic and kids need to know how to use the technology.

1. Must be a set limit. No overdraft permission.
2. No ATM Cash Withdrawals
3. It can help to learn budgeting.

I would fear it being used to purchase drugs and alcohol. A dealer could take credit/debit cards and use an innocuous name - these people are ingenious in their schemes.

Some stores that take debit cards don't print detailed receipts, so a purchase could just say food or something, disguising the real purchase.