Looks like shooting IR at the audience is how some/most of these systems work: http://archive.wired.com/entertainment/music/news/2004/11/65683?currentPage=all

Looks like shooting IR at the audience is how some/most of these systems work: http://archive.wired.com/entertainment/music/news/2004/11/65683?currentPage=all http://archive.wired.com/entertainment/music/news/2004/11/65... but yes, it does sound like its probably like plain old IR light and not a laser.