masterdw - A soldier MUST obey the orders of his superior UNLESS the orders are clearly illegal, or if the officer is acting beyond his authority................................Master may order slave to break into a certain house.
I would argue that the US law is a higher authority than the Dom's instruction and therefore that order was illegal.

In America slavery is voluntary and tests can be failed.
I cannot speak for America but in Europe slavery is illegal in any form and even the act of drawing up of a slave contract or agreement in itself may be considered an illegal act. Looking into my crystal ball I see the day in the not to distant future where use of the word slave in a context which makes slavery appear acceptable will be made illegal,