To do a comprehensive search of the journal literature on your topic, you must use journal indexes. The full-text journal databases on Lexis and Westlaw do not contain all of the law journals published, and, for those that are included, the starting date of coverage is rarely volume 1. The journal indexes, in contrast, include virtually all legal journals from volume 1 and, in the case of the Legal Resource Index, legal newspapers as well.
Here are links to the electronic versions of a few of the major law journals with an emphasis on public policy issues. Print editions are available in the library as well.