Way for moderators to quietly/silently follow certain members activity and get notified?

[Clover13]

We have some problematic members such that we want to get notified every time they post content (new topic, reply to topic, etc) but without them knowing we're watching over them (i.e. we probably can't follow them without them picking up on it and dealing with the BS around that).  There is a specific reason for doing it this way (quietly/silently).  Is it possible and if so, where can I set it up?

[Adriano Faria]

Here's a good way:

 

[Jim M]

There would not be a way in the core software to perform this, it would require a customization.