They are claiming it's for 'security' from 'leaks'.

trying to hide their 2000 years of Murder, Satanism, and Fraud.

Vatican introduces new security measures after Vatileaks scandal
Vatican clergy and employees will be issued with an identity card complete with a microchip-tracking device in sweeping new security measures designed to prevent a repeat of the Vatileaks scandal.

[link to www.telegraph.co.uk]