The Domestic Nuclear Detection Office (DNDO) is responsible for addressing the threat of nuclear smuggling. Radiation detection portal monitors are key elements in the nation¿s defenses against such threats. DNDO has sponsored testing to develop new monitors, known as advanced spectroscopic portal (ASP) monitors, to replace radiation detection equipment now being used at ports of entry. DNDO expects that ASPs may offer improvements over current-generation portal monitors. This testimony: (1) discusses the principal findings and recommendations from a May 2009 report on ASP testing; and (2) updates those findings based on info. from DNDO officials on the results of testing conducted since the report¿s issuance. Illus.