Addresses what reference librarians should do when patrons ask for information about explosives or dangerous drugs. Explores how reference librarians can possibly deter people from dangerous, unmediated searches by proactively providing information and actual examples on the dangers and risks of making and using these materials. What should you do when patrons ask you how to help them obtain information on explosives or illegal drugs? This is an old question first addressed in the library literature decades ago (Hauptman, 1976). Should we simply help patrons as we would for any other type of request, or do we have a higher duty to society in general and not help patrons obtain information that may potentially damage others? Hauptman visited 13 libraries, both academic and public, asking for information on constructing an explosive device, and none of them refused to supply the information on ethical grounds. Several years later Dowd (1989) performed a similar experiment. He also sampled 13 libraries, both academic and public, but instead of explosives he asked reference librarians if they would help him find out how to freebase cocaine. In his dress, speech, and manner he looked like a non-academic, and he tried to indicate that he was not engaged in scholarly research. Here too, no librarian turned him down. The help he received ranged from extensive to minimal. Despite the similarity of these two experiments, Hauptman, both in his original study and upon reflection 20 years later (Hauptman, 1996), and Dowd reached different conclusions. Hauptman concluded that supplying such information implies an abrogation of professional, social, and human responsibility, while Dowd affirmed the necessity for the unfettered dissemination of information. A day after the Oklahoma City bombing in 1995, a patron asked me for information on explosives. Maybe she was just curious about explosives. Perhaps she had plans for a copycat bombing. I decided that it was not my role as a librarian to ask her why she wanted this information. I directed her to several reliable books in our collection. These books, selected by professional librarians, explained the full scope of explosives, including their dangers, and necessary precautions in their manufacture and handling. I could have turned down this request. What might have been the result if I had? If this patron was actually planning on making explosives would she have sought less reliable information on explosive manufacture, thus exposing herself and others to risks? Moral dilemmas like this are nagging questions that are hard to deal with because we can never really know the exact intentions of the patron.