Search opinion letters by choosing one or more filters on the left and the corresponding opinion letters will display in the center of the page. The more filters you choose on the left side, the wider the search results because the search engine will display all results for each of the selected filters.
You can also filter opinion letters by typing a search term related to the Title or Opinion Number into the “Search” box in the center of the page. Type a name, keyword, etc. in the search box to display results based on the parameters you entered. The more search terms, the narrower the results. Consequently, too many search terms may yield no results.
To remove a filter term simply click on the red circled 
located to the right of the filter term.
To clear all filters simply click on "Remove Filters" located above your search results.