What will happen if I overspend with my ADP TotalPay Card?

I thought I remember seeing a 35 dollar fee if you overspend, but this card was only loaded with money from my employer which I no longer work with. So what I'm asking is will it let me over spend? Would it be a really dumb idea to just go on a shopping spree. I mean the card never gets loaded so they can't take money away from me once there is none left.