Stella: The man is taunting me, Mac. He sent me a dead rat as a message. Put yourself in my shoes.
Mac: Try stepping into mine. I'm in charge of this lab, responsible for everyone and everything that happens here. I admire your passion Stella but what you did is reckless. And more importantly, it could compromise any future criminal prosecution.
Stella: What I'm doing is perfectly legal!
Mac: And contrary to the policies of this lab and this department.