Not hire Pedro and Juan? If Pedro and Juan have managed to fool mom and pop and have mastered good English skills, then it has already begun to work because Pedro and Juan are assimilating. Let's face facts, there are millions that can't speak a word of English that mom and pop know exactly what they are doing by hiring them and paying them under the table.
The guys from the Assoc. Of Retired Border Patrol who were shown on C-SPAN a couple weeks back said that back when enforcement raids were more common, they stuck to medium and large businesses, not to companies with a handful of employees and less than 5 illegals.