ENFORCEMENT WORKS!

“The school-to-school migration within Northern Virginia started just as Prince William began implementing rules to deny some services to illegal immigrants and require police to check the immigration status of crime suspects thought to be in the country illegally.”
Washington Post

Northern Virginia hit with school migration costs

Prince William County Policies Drive Immigrants To Inner Suburbs

Hundreds of foreign-born families have pulled their children from Prince William County public schools and enrolled them in nearby Fairfax County, Arlington County and Alexandria since the start of the school year, imposing a new financial burden on those inner suburbs in a time of lean budgets…

The rest here.