P.O Box is not "supposed" to count for verified established residence, and any school has the right to do do "checks" on that type of situation but they don't. Most just use relatives house addresses in the district and say they "moved". Another exploited area is that of "custody" / separation and kids bouncing from parent to parent residences. Idf the MHSAA really cared , they'd create a legitimate enforcement branch of their organization, but they don't care.