It will result in

• increased racial profiling
• reduced reporting of crime for fear of being asked questions that could lead to deportation
• reduced protection for victims of domestic violence.

The ACLU has more.

These combined measures will ensure that more immigrants will avoid contact with local law enforcement, putting entire communities at risk. For instance, immigrant victims of crime will hesitate to report the crimes to the police if they fear adverse immigration consequences from their contact with the officials. Even now, criminals often target immigrants for victimization because they know immigrants are reluctant to report the crimes. Meanwhile, the perpetrators go undetected and continue their criminal activities. Moreover, under these proposed CLEAR Act provisions, immigrants who could offer useful information to security investigators will be even less inclined to come forward, for fear of personal immigration consequences. In other words, the CLEAR Act ignores the benefits of community policing in favor of a "police state" for immigrants, a shift that will jeopardize the safety of us all.

The CLEAR Act also changes the priorities of law enforcement agencies throughout the government. It undermines public safety at the local level by shifting the focus of law enforcement officials away from fighting crime and towards enforcing federal immigration law. At the national level, the Act forces the federal immigration system to treat all immigration law violators as if they had committed criminal offenses. With millions of immigrants in the United States but likely only a handful of terrorists, it doesn't make sense for law enforcement efforts to be diverted and diffused in this way.

...Undoubtedly, one of the great challenges we face as a nation in the post September 11 era is achieving a balance between security and liberty. The CLEAR Act does not help us achieve that balance. It is the latest in a series of measures directed against immigrants by anti-immigration forces who are exploiting the tragedy of September 11 to advance their own agenda. Their actions dishonor the memory of the many immigrants, as well as U.S. citizens, who perished in those attacks.

The Clear Act has not passed Congress. Proponents tried to attach it to other bills, but that failed. Keep an eye out for any return. Here's an action page to learn more.