I've never recorded my boss (he cool than a mufucca) just peeping some of the fakery bakery logging in.
In the US, it depends on what state you live in whether you have to have consent or not, but what I've read is that whether consent was necessary or not, the recording, if it contains a violation of a protected right, is admissable regardless.
Harris vs. Atkinson Cotton Warehouse (Case 2:14-cv-02603)