Washington’s Duke Ellington School of the Arts. (Michael Robinson Chavez/The Washington Post)

Regarding Carl E. Nash’s March 3 letter, “How to track students’ residency”:

Mr. Nash’s list of ideas for ensuring that D.C. Public Schools students are D.C. residents was wrong to include a requirement that students who live with grandparents “produce proof” that the grandparents have legal custody of the students.

The legal process to gain custody can be arduous, expensive and in itself an impediment to a child having a safe, loving home. A change in legal custody also may not be what the grandparent(s), parent(s) or child want, making the process even more burdensome and expensive.

While the burden to the school system of educating all of its nonresident students may be great, the cost to a given D.C. taxpayer likely amounts to pennies.