It seems that nowadays, with a more competitive admissions process, candidates may be resorting to tried and true "job interview" techniques, one of which is to send a "thank you note" to an interviewer. I don't see a problem with it...it may not help much (if at all) to send the note to a student interviewer or a praciticing pharmacist who volunteered for your panel. But for the faculty interviewer, it may help...I never did it, so I can't tell you if it works or not.