Yesterday, in a complicated series of eight opinions from 16 judges spanning 100 pages, a majority of the U.S. 5th Circuit Court of Appeals, sitting 
en banc, held that Plano, Texas school principals had qualified immunity in a lawsuit charging them with restricting elementary school students' distribution of religious literature because the law was not clearly established.  A separate majority of the court held that the principals' actions were unconstitutional.  In 
Morgan v. Swanson, (5th Cir., Sept. 27, 2011), Judge Elrod wrote for the majority on the issue of constitutionality.  She said:
In short,  whatever  latitude  school  officials  may  have  with  respect  to school-sponsored speech under Hazelwood, or with government-endorsed speech under  the  Establishment  Clause—that  is,  speech  that  could  be  erroneously attributed  to  the school—outside  of  that  narrow  context,  viewpoint discrimination  against  private,  student-to-student,  non-disruptive  speech  is forbidden by the First Amendment.....
[W]hat one child says to another child is within the protection of the  First  Amendment unless  one  of  the  narrow  exceptions  discussed  above applies,  and  none  does  in  this  case.  Accordingly,  we  hold  that  the  First Amendment protects all students from viewpoint discrimination against private, non-disruptive, student-to-student speech.
Education Week reports on the decision.