Title XXI requires that states establish measures to prevent the replacement of private coverage under group plans with coverage under public plans. In order to meet this requirement, some states have enacted restrictions to entry into their state child health insurance programs known as "firewalls." This document reviews the firewall provisions of MinnesotaCare, the State of Minnesota's program which makes health insurance available to low-income uninsured Minnesotans who do not qualify for Medicaid. It also considers the extent to which these firewall policies were successful in preventing the "crowding-out" of private group coverage.