No argument left alive
The Dutch police’s Internet Research and Investigation Network (iRN) by default only uses free and open source solutions based on open standards and developed publicly.
“The source code must be available on the Internet, we have to be able to audit the code that is in use.”
The specialist police unit is now using 2200 Ubuntu Linux workstations, and has been using Linux desktops since its inception in 2003.
An article written for the OSOR, you can read it here: ‘Open source only’ at Dutch police Internet forensics.