We read:
"A US high school student who was suspended for unfurling a banner saying "Bong Hits 4 Jesus" did not have his rights violated, a divided US Supreme Court ruled today, in its first major decision on student free-speech rights in nearly 20 years. The high court's conservative majority ruled that a high school principal in Juneau, Alaska, did not violate the student's constitutional free-speech rights by confiscating the banner and then suspending him.
Student Joseph Frederick says the banner's language was meant to be nonsensical and funny, a prank to get on television as the Winter Olympic torch relay passed by the school in January 2002. But school officials say the phrase "bong hits" refers to smoking marijuana. Principal Deborah Morse suspended Frederick for 10 days because she said the banner advocated or promoted illegal drug use in violation of school policy.
Mr Frederick, 18, had been standing on a public sidewalk across the street from the school when Ms Morse grabbed his banner and crumpled it. Students had been allowed out of class to watch the event.
The majority opinion written by Chief Justice John Roberts said the court agreed with Ms Morse that those who viewed the banner would interpret it as advocating or promoting illegal drug use, in violation of school policy. Justice Roberts, who was appointed to the court by President George W. Bush, said a principal may, consistent with the First Amendment, restrict student speech at a school event when it is reasonably viewed as promoting illegal drug use.
Source
Now where do I find that exemption concerning illegal drug use in the Constitution?
