There is no database of all policies, but there are some tricks to finding them. You can always start by looking through federal legislation at https://congress.gov/
For state regulations, you would have to find an individual state's legislature and search it. You can do that in google. Here is a link to CT's state legislature search.
For hospital policies, you will have to search the web; you can try searching with a variety of terms such as 'hospital policy' and your topic, or 'hospital manual', etc. You can also limit to specific sites in google. For example, if you only wanted to search the Yale hospital website, you can append 'site:www.ynhh.org/' to your search terms in google to search only the Yale New Haven hospital website.
Example google search: site:www.ynhh.org/ hand hygiene policy
You will also want to think of the organizations and advocacy groups that care about your topic and look on their websites. They might have position statements on current policies. You can identify those policies and then find them online. It is a nice way to do a backwards lookup.
As always, if you get stuck, you can always Ask A Librarian.
