Star Trek: The Next Generation1987

Captain Phillipa Louvois:
I can use serving officers as legal counsel. You, as the senior officer, would defend.

Capt. Picard:
Very good.

Captain Phillipa Louvois:
And the unenviable task of prosecuting this case would fall on you, Commander, as the next most senior officer of the defendant's ship.

Commander William T. Riker:
I can't. I won't. Data's my comrade. We have served together. I not only respect him, I consider him my friend.

Captain Phillipa Louvois:
When people of good conscience have an honest dispute, we must still sometimes resort to this kind of adversarial system.

Commander William T. Riker:
You just want me to prove that Data is a mere machine. I can't do that, because I don't believe it. I happen to know better, so I am neither qualified nor willing. You're going to have to find someone else.