The article is about Google's Pryor, Oklahoma data center. A large section, however, is devoted to Google's and the center's approach to security.
The relevant paragraph is the longest one. It begins:
"We take security and privacy very seriously which is why our facilities are not something we have regular tours through," he said. "This is why we have the kind of fencing which you might see at a medium-security prison, because if that trust (in Google) goes away, it would be very difficult for us to get it back." "Besides the fencing and the gate, we have an extensive security system," Wooten said. "Of course, we have security cameras, highly controlled badge access in biometrics to the facility and specific parts of the facility which are more sensitive, iris scans, fingerprint scans, and even restricted access to other 'Googlers' -- only the people who are authorized to be in a certain location have access. Even people from other Google data centers, there are five in the U.S., don't have clearance to our center -- security is that tight."