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In Mexico, it is unknown how many public school students have had previous experiences in U.S. schools. When such children come/return to Mexico and because of their physical appearance, last name and place of residence, they seem like any other child. So, to make an estimate of the frequency of this phenomenon, we selected a representative sample of public schools in the state of Nuevo León (with a sampling error of ±5%). Our sample was stratified by density of migration and enrollment per municipio ( municipality). This strategy guaranteed that we would include representative schools in the regions with highest populations and in those with highest migration rates. Ultimately, we came up with a sample of 174 schools (90 primarias (elementary school) and 84 secundarias (middle school) ) and visited each one.