RIA Checkpoint This link opens in a new windowRIA Checkpoint has the complete libraries of federal, state, local, and international taxation. It also includes tax research materials encompassing the Internal Revenue Code, Treasury Regulations, Committee Reports, Tax Treaties, IRS Rulings and IRS Releases, legislation (pending and enacted), Federal Tax Court and Federal Court Decisions, Tax Court Memoranda, editorial materials, journals, treatises, and Tax News Alert databases.