How visible should your convention or trade show security be? The answer is that it often needs more visibility than you might think. Here's what you need to know to find the right mix of visible and 'behind the scenes' security at your big show.  Why Is Visible Security Valuable? The value of visible security is twofold. First, it discourages troublemakers. Someone who might consider pilfering from the registration table's cash drawers is likely turned off when they see security officers watching the area and cameras trained on the registration area.