For most in lines here and across the country, the chance to "live legal" is a long time coming and a one-time shot.
And yet the sheer urgency felt by more than 1.5 million to win deferred deportation and a work permit could prove problematic.
"We are seeing people who are really desperate and when you have desperate people, they do listen to scammers," said Wafi Abdin, an attorney aiding applicants at Houston's Catholic Social Services.
"They need to avoid scam artists. People need to avoid going to notarios or immigration consultants or anyone who says, ‘I can get you special processing'," added Sister Veronica Schuler, also an attorney at Catholic Social Services.
Florida Republican Senator Marco Rubio was in Houston Tuesday and said the structure of the President Obama's program will generate plenty of victims.
"I feel there is going to be a bureaucratic mess that's going to happen because of this paperwork. I think there are people who are going to be taken advantage of. I think we are going to see some instances of fraud," said Rubio.
Attorney Richard Sindelar, who teaches foreign affairs at the University of St. Thomas, believes applicants can steer clear of trouble by working with a certified immigration attorney or an accredited representative.
"There are already people promising results for $100 or $200 and they are not going to be able to deliver. It's just a scam," said Sindelar.