Google staff have to go through a series of identity checks to gain access to the data center building and different parts of the facility.
Staff at the datacenters carry identity badges that are made using lenticular printing, which makes them difficult to forge.
In some of Google's datacenters, staff identity is checked by scanning their irises, as seen here.
Photo credit: Google/YouTube.com
Sonja Thompson has worked for TechRepublic since October of 1999. She is currently a Senior Editor and the host of the several blogs.