How to disable WLAN permanently?

[van Schelve <public van-schelve de>]

Hi Folks!

Can someone tell me how to disable wlan in networkmanager permanently on a
defined number of systems?

We won't have wlan support for every system - only for a limited group of
users.
Blacklisting the specific kernel module will work for the internal wlan
card. 
But what happens if a user has his own usb / pcmcia card?