Q. I’m the HR director of a 45-employee company and have one assistant. Due to the firm’s growth, I’m considering giving my assistant more responsibility. My concern: The assistant is very friendly with about 10 other employees. Two are her roommates. What’s to stop her from divulging information to her friends? I have said nothing to her about my concerns yet. What can I express to her without overstepping her legal rights? —M.I., New York