Don't believe everything you hear!
Good evening,
Crew Control will not, and cannot, force you to undertake a duty that is illegal. What they will do, is ask you to undertake a duty, and if you accept it, you are now accepting the responsibility of whether it is in fact legal. If it is not, and there is an incident, you are the one that is liable.
Of course, there may instances where it simply involves different interpretations of a rule. In that case. just submit a CHIRP to Corporate Safety so it is on file.
The best thing to do if you have any concerns is state to the controller, "Is this duty legal". Remember the date and time of the call. The conversation is always recorded on tape and it now makes the controller accountable. If there is any question of legality at all, they will state they will call you back.
I speak from experience.
Regards.