There are allegations that the Border Patrol in Riverside forced arrest quotas on agents, with punishment for failing to reach the goals. You knew this had to be coming at some point, as it is an old and familiar story. To prove "victory" or at least "progress," you need a body count--something to put in a report for the media, Congress, whomever.
As it turns out, however, there are already informal quotas:
Calhoon said the agency does use goals to inspire agents, for example, by driving units to compete against each other, and often the measuring stick turns out to be number of arrests. But he said setting numeric targets was not common practice — nor one he would recommend.
So agents are already rewarded for body count. If somebody looks Hispanic or is speaking Spanish, round them up. Even if they're in the country legally, you get credit for an arrest.