How to tap a governor's phone

The bugs in the campaign offices would be more difficult, former investigators say, and might have required investigators to make stealth entries to plant the listening devices.

“Typically what they will do is surreptitious entries,” said Brad Garrett, a former FBI agent and ABC News consultant.

Though every situation is different, Flosi said agents will often pose as repairmen or try to get a job with a night cleaning crew. On other occasions, agents have broken into buildings.

“You might have to pick the lock and disable the alarm,” said Garrett. “The key is to get in and out, and nobody knows that you’ve done it.”