Google analytics ID's are tied to the account that created them.
Presumably the FBI doesn't all share just one massive "fbi@gmail.com" email address.
Even if a bunch of FBI employees decided foolishly to use google analytics on their honeypot sites, one would expect them to all separately sign up using different google accounts - either using their real email addresses, or hopefully throwaway ones.
I think you're confusing Google accounts (email addresses) with Google Analytics accounts (tracking ID prefixes). A single user can create dozens of GA accounts.
Presumably the FBI doesn't all share just one massive "fbi@gmail.com" email address.
Even if a bunch of FBI employees decided foolishly to use google analytics on their honeypot sites, one would expect them to all separately sign up using different google accounts - either using their real email addresses, or hopefully throwaway ones.