***[For updates as we work through the bill's details, follow our What's in the Bill tag.](http://colorlines.com/cgi-sys/cgiwrap/colorlne/managed-mt/mt-search.cgi?...)*** One of the things I'm looking for as I cull through the Senate immigration bill are places where immigration enforcement expands. The U.S. already deports more 400,000 people each year and spends more on the border than at any point in U.S. history. It's been widely reported that at least on the border, more is coming. Before any currently undocumented immigrants will be allowed to apply for a green card in a decade or citizenship three years later, the Department of Homeland Security will spend as much as $6.5 billion to deploy 3,500 additional border patrol guards and add walls, fences, drones and checkpoints to the southern border. But here's a piece that's gained less attention. As part of this buildup, the bill expands the number of immigrants who will face criminal prosecutions for trying to come back to the country after they're deported. People get sent to federal prison for crossing the border. They're locked up for years.