It's a clear violation of the First Amendment Establishment Clause for public school officials to encourage students to pray in class or to participate in prayer activities with students during class. In an attempt to resolve the situation and avoid court action, the AHA sent a letter six months earlier that outlined why school-sponsored and school-promoted classroom prayers are unconstitutional. School officials ignored the letter.
MORE: http://www.washingtonpost.com/blogs/on-faith/wp/2013/12/13/honest-and-dishonest-bias/