Subliminal messages are PUT in many different places, THE exact locations have been shown on the internet, and on tv. CRACKing the code of these messages can be difficult and tricky. Some messages have been PIPEd in stores with music that encourages people to spend more, they usually do this when sales are DOWN. The messages can only be recognized by a skillfullt trained person, and even NOW with the advances in technology, they are harder to detect or prove. Finding these messages can reveal many things that someone is trying to tell you.