Want to know how to track Homeland security spending by looking through government databases? EFF's Dave Maass has put together a handy how-to: https://www.eff.org/deeplinks/2025/12/homeland-security-spending-trail-how-follow-money-through-us-government-databases
The Homeland Security Spending Trail: How to Follow the Money Through U.S. Government Databases

The U.S. government publishes volumes of detailed data on the money it spends, but searching through it and finding information can be challenging. This guide covers the key databases that store information on federal spending and contracts, government solicitations for products and services, and the government's "online shopping superstore," plus a few other deep-in-the-weeds datasets buried in the online bureaucracy.

Electronic Frontier Foundation