they can do whatever they want that is legal....

same thing for you... as long as it is legal, u can do whatever you want also. Else, just lawsuit...

but the general rule is don't pick a fight with them. ignore and keep quiet. if need to serve notice, but don't feel well, just get a doc MC.

like i said, they can do anything that is legal and take legal actions.

so for example, if they found out that you committed a crime in the office, they have every right to take action.

But if it is a small thing like you took 2 extra pen from office, forget about it.

It all depends on how much effort the HR department wish to spend on "disturbing" you.