If you go into the interview not knowing anything about this particular job, it makes you look bad. The interviewers will ask themselves, Why would this person apply with us when he or she does not know anything about us? Lacking this knowledge makes it look like you are applying with any agency just to get your foot in the door. Even if this is true you do not want to give the appearance that you will use this agency as a stepping stone to a career with another agency. You do not have to know everything about this agency. However, take the time to read up on this agency. Prepare yourself for this question.