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Limit your searches to "Library Catalog" for books, which can be good for broad understanding and historical context. You may need to eliminate government documents by removing "United States" as an author in the Advanced Search.
This database has national and international law review articles, a good choice for articles on the legal implications of a policy: its strengths and weaknesses as a law, the relationship of the law to court decisions, and the potential effects of the application of a policy.
Substative background information about the laws, institutions, and actors that have governed America throughout its history, covering topics like from presidents and Supreme Court justices to specifics of policy history, critical legislation, and party formation. This is a great source for gaining context about your topic.