It was the fall of my first year of law school, in 2005, and I was headed to my first interview for a legal internship. I wore my only interview outfit, a conservative navy skirt suit and a cream blouse. A classmate complimented me on the look. Then she added, “But you’ll never look really professional with your hair in dreadlocks.”

I was reminded of that day as I watched video footage of a black student in Gretna, La., crying as she was forced to leave school because school officials objected to her hair. They claimed her box braids violated a dress code prohibition against “unnatural” hair styles because the braids included hair extensions. Extensions are sometimes used in black hairstyles, like braids, that don’t require the use of damaging chemical straighteners. The student and a classmate sent home for the same reason were not allowed to return until a judge issued a temporary restraining order against the school after both girls had missed several days of classes.