HARRISBURG — A legal advocacy group for public school students has asked the state to examine whether enrollment policies in some of Pennsylvania's 501 school districts are unnecessarily preventing children from going to class.

In the last school year alone, the Education Law Center has been asked to intervene in 270 cases where questionable policies and practices delayed the enrollment of new students by up to a month or longer, according to a complaint the center sent to the state Education Department.

State law requires families to provide proof of age, residency and immunizations for new students before they can enroll in public schools. It also requires districts to enroll students who live with caregivers other than their parents if the caregivers meet certain qualifications.

But some families have encountered requirements that are too rigid, exceed what the law requires or are specifically banned by the law, said Janet Stotland, co-director of the Philadelphia-based center.

"The whole point is not to make it a crapshoot to enroll students in school districts in Pennsylvania," Stotland said.

The Education Department was reviewing the complaint, but had no immediate comment Tuesday, spokesman Michael Race said.

The complaint, sent on Friday, cites four examples of its concerns without identifying school districts or students.

In one case, a mother of twins could not comply with a requirement to provide photo identification because she did not have a driver's license or other ID. The children missed one month of school until the law center got involved, according to the complaint.

Children who move frequently due to poverty, homelessness or foster care placements are most often caught in the middle of enrollment disputes, Stotland said. Nearly 13,600 Pennsylvania school-age children are in foster care, according to the Department of Public Welfare.