The Supreme Court agreed this morning to hear a challenge to a Maine law that bans families from a student aid program if they choose to send their children to religious schools. Parents in the Pine Tree State argue in their petition to the court that Maine’s prohibition against using taxpayer funds on sectarian schools violates the U.S. Constitution. They say that the Supreme Court’s decision last year in Espinoza v. Montana Department of Revenue held that a state may not exclude families and schools from participating in a student-aid program because of a school’s religious status. But, they say, the court did not resolve the question of whether a state may nevertheless exclude families and schools based on the religious use to which a student’s aid might be put at a school. “By singling out religion—and only religion—for exclusion from its tuition assistance program, Maine violates the U.S. Constitution,” …