There are two primary databases for psychology academic articles: PsycArticles and PsyInfo. Both of these databases provide extensive access to full-text journal articles and other materials. For a complete list of the databases and other resources available in psychology, see the Lauinger Library's Psychology Research Guide.
ProQuest Political Science and PAIS Index are the two primary databases available for public policy article searches. Policy File Index is a searchable database of policy documents issued by a variety of research institutes, think tanks, and other institutions working within the area of public policy. For a complete list of resources available, see Lauinger Library's research guide on Public Policy.
Ethics, as a scholarly subject, falls within the area of philosophy. You have access to the two databases that provide extensive coverage of philosophy articles - JSTOR and Philosopher's Index. For a complete list of resources see Lauinger Library's Philosophy Research Guide.