KISS = Keep It Simple Stupid
Just don't talk about anything you wouldn't want any one else to hear while you are in range of any listening devices.....Simple.

Your 'story' doesn't hold water, by the way.
We dont know where they are placed
So how do you even know they are there?

There are several different way to detect the presents of various bugs and devices for recording sound and such. They do require a bit of money or technical expertise to buy or build. The devices themselves are not very cheap, and wouldn't be used willynilly.

So if I were you, I would be worrying more about how to hire an attorny to represent you, than trying to find some way of detecting or defeating such devices. Whom ever place them, if they do even exist, is probably a governmental agency building a case against you.