My Govt ID has a picture of me (not a flattering one though, i look like a serial killer in it) the name of my department in full, the departments logo, my signature and full name and my employee identification number. on the back there is a warning saying that the card is property of the department and if found should be handed it at a police station.
We have to wear them all the time.
In addition, if we are going into the Assembly or into Stormont (our parliament buildings) then we have to have to use our ID pass to get in, then hand it in and get another, different one for use inside the building.