She won't ever find anything because you would never do that (it's probably illegal) but she will stop her behavior believing she is being recorded and probably would move which is a shame, but you could probably recover from that.I'm just joking of course, or am I?

This will lock in any tenant as long as they want to stay,   unless they engage in egregious (and proveable) acts of nonpayment or behavior problems.   

It is very possible the previous landlord ripped him off--tenants aren't the only ones with bad behavior.

Monopolistic behavior is bad.

What is everyone using to display property info to potential investors?

Your image is not displaying.

This seems like you've allowed her behavior over several months, which is why she thinks you're probably not going to do anything.

Online Display Ads.These are the ads that you see all over the Internet that follow you around but you're doing to do them a little differently.

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My friend said in this situation can use social network to put pressure on him like exposing on Yelp, BP, facebook that can display on search result.