Here is the statute that so incenses and inconveniences some returning nationals:

http://www.dhs.gov/files/programs/editorial_0525.shtm
"Biometric procedures .apply to international visitors holding a non-U.S. passport or visa"

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"The Department of Homeland Security recently published amendments to the regulation governing the US-VISIT program. This Final Rule, which will become effective January 18, 2009, requires all non citizens (with some exceptions noted below), including lawful permanent residents, to register with US-VISIT, upon admission to the United States. US-VISIT is the electronic registration program implemented at land, air and sea ports in the wake of the September 11 attacks. The program has been implemented in stages over the past few years, and now requires all visitors and temporary residents to register at a US-VISIT kiosk upon admission to the United States. Non citizens are required to provide biometric data, meaning fingerprints and electronic photographs, as the system registers both admissions and departures. Effective January 18, 2009, the program has been extended to permanent residents returning to the United States from a temporary trip abroad. 
"Canadian visitors, diplomats (A, G and NATO status), children under 14 and individuals over 79 are not required to register. All other non-immigrants (visitors, students and temporary workers) and permanent residents will be required to register with US-VISIT upon arrival. Registration at departure is also required, but has not yet been implemented in all airports, seaports and land borders. "

Here are some web sites pertaining to non-citizen participation in street demonstrations:

http://conversations.blackvoices.com/education/0a2485872d5240199201c5698e653560/illegal-aliens-on-the-streets-/17735f7a7e1b47a0acd22ca2cac36230

"Recent nationwide street demonstrations by illegal aliens and their supporters, demanding amnesty for 12 million or more illegal immigrants, have been portrayed in the media as representing the views of all "Hispanics in the U.S. However, according to opinion polls, including one conducted by the Pew Hispanic Center, Americans are divided on the issue with 53% saying that people who are in the U.S. illegally should be required to go home. According to the Pew Study, a growing number also believe that illegal immigrants are a burden to the country, taking jobs and housing and creating strains on the health care system. These facts reflect the position of many Hispanic-Americans -- citizens, legal immigrants and the children of immigrants -- who strongly oppose amnesty for illegal aliens and support enforcement of U.S. immigration laws.

"In response to the hundreds of thousands of illegal aliens who have been marching under the Mexican flag demanding to be rewarded for having violated U.S. immigration law, a new coalition has been formed to accurately represent Hispanics in the U.S. who work hard, play by the rules and want the opportunity to see their own kids get ahead. Known as "You Don't Speak for Me," the coalition aims to dispel the impression that the people out on the streets represent the views of all Hispanic-Americans."



Two other bits of information (from a how to behave in a demonstration site):
"The police do not have to say anything to you upon arrest, including telling you your "rights" or what you are being arrested for.

"Absent an arrest situation, if a police officer approaches you (on the street, for instance) and asks you to identify yourself, you do not have to do so. There is no requirement generally that individuals identify themselves to police officers or carry identification cards (except while driving). If this happens to you, politely decline to identify yourself and ask the officer if you are under arrest or if you are free to leave. If he/she responds that you are free to leave, do so".
http://www.portaec.net/library/action/exercising_your_rights.html#5

On another site, one blogger wrote:
* Foreigners may not in any way participate in the political affairs of the country. This ban applies, among other things, to participation in demonstrations and the expression of opinions in public about domestic politics.
* Equal employment rights are denied to immigrants, even legal ones, even those with green cards.
* Only citizens may serve in the military as officers, on airline crews , and chiefs of seaports and airports.
* Members of both houses of Congress as well as the Supreme Court must be a citizen by birth....
* Immigrants , even legal ones , may not become members of the clergy.
* Foreigners, legal or illegal, may not own land.
* Any citizen may arrest illegal immigrants and their accomplices, turning them over without delay to the nearest authorities.
* Foreigners, legal or otherwise, may be expelled for any reason and without due process.
THEY SHOULD RUN THE CLINIC OVER HERE SINCE THERE ARE ENOUGH MEXICANS ON THIS SIDE THAT COLD USE THE HELP.

In response, another blogger wrote: "I don't know where you got your info but several of your statements are totally incorrect. Foreigners may own land in this country. Check out how many Japanese buy land here as investments. Military there are many military that are not citizens of the USA. Clergy, have you ever been to church? Demonstrations, have you ever read a newspaper or watched national news in the USA? There are demonstrations all of the time by non- citizens. Get your facts straight before you post!"

http://www.topix.com/forum/mx/chihuahua/TPHOO7NTR968QPF59