Username or EmailPassword
We implemented a similar system for a small local police department a few years ago.
The hardware was a pentium M powered 1024x768 touchscreen "brick pc", mounted on an movable arm with a separately mounted usb backlit keyboard/trackpad that could be detached and pulled onto the officer's lap. The system connected to HQ over CDMA modems, but all traffic was encrypted (AES) over an IPsec VPN tunnel.
We still support the system and it works rather well.