There are four key US Supreme Court cases that govern students' speech in a school environment, according to Scott Johnson, law professor at Concord Law School. In a recent commentary, Johnson reflects on the current law, students’ privacy rights, and on the court's potential to expand the scope of the law when it hears the case of a high-schooler who was penalized for profanity-laced Snapchat posts about the school. As the law currently stands, speech that may be protected for adults outside of the school environment – like offensive or vulgar language – can be restricted for students inside of the school environment. This commentary is a must read for all parents ,because on some occasion your children may speak their mind online, and what is protected and what is not runs a very fine line.