You can find books on interrogation in the online library although none specifically addressing FBI interrogations. To find books, click on the Find Books button on the library homepage and enter interrogation into the search bar.
It will be easier to find articles on this subject. If articles are acceptable here is an example of how to set up a search in ProQuest Central. To find ProQuest Central, choose the Find Articles button on the library homepage.
Your search terms will be FBI AND interrogation OR tactics.