Debit or Credit for Brent's School Cafeteria

Comment from a reader on "Brent's New Class - Get Into Debt!":

You obviously are not a student at brent nor do you have a child enrolled at the school.

Their cafeteria system has improved a lot since I first enrolled my child. The cashless system discourages students from bringing cash to school to avoid theft or unscrupulous spending. Parents are asked to deposit a minimum amount to their child's account to enable their kids to use their ID as a DEBIT card, not a CREDIT card! Parents know exactly how much they deposit into their child's account. Parents may also ask for a printout of their child's consumed food items. This is a way of checking on what their child is buying.

I am a Brent parent and I am very happy with their cafeteria system not to mention the high quality of their food. Maybe you should check out their cafeteria for yourself and save your obviously unfair and unnecessary comments until then.

[The Subic Bulletin] Please let the readers know what happens when the ID card has no credit?
Do they refuse to serve the children or run into a "negative balance" as reported by other readers?