Disable networking for specific users

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http://askubuntu.com – I'm working on Ubuntu/Mint distro meant to be ran Live. There are multiple accounts that fall into three general groups: Admin, Internet and Security. Admin is obviously has the authority to do whatever. Internet account is for using the Internet. The other accounts are Security accounts. Under no circumstances is any networking Internet, printer, Bluetooth, WiFi devices, etc, allowed. What I'd like to do is remove the network drivers from the kernel, but that would disable the accounts that need Internet. What are the lowest level way(s) to disable Internet for these security account (HowTos)