This presentation will teach you how the government gathers information both domestically and internationally in the 21st century. There are tried and true methods that have been around since time immemorial, as well as new techniques such as FATCA. We will begin on the domestic side with IRS summonses, subpoenas, search warrants, and sting operations, and then make our way to international evidence gathering. Specifically, we will discuss mutual legal assistance treaties, tax treaties, information exchange agreements, FATCA, and letters rogatory.