For as long as schools have policed hairstyles as part of their dress codes, some students have seen the rules as attempts to deny their cultural and religious identities. Nowhere have school rules on hair been a bigger flashpoint than in Texas, where a trial this week is set to determine whether high school administrators can continue punishing a Black teenager for refusing to cut his hair. The 18-year-old student, Darryl George, who wears his hair in locs tied atop his head, has been kept out of his classroom since the start of the school year.