Most people have heard of the Thin Blue Line. It has become a visible image of the line that police officers stand on each and every day. They remain vigilant, alongside each other and those they protect, guarding them from harm's way. But in front of each blue line, there is an invisible line. This line is an image that no one else sees. This is the line that protects the thin blue line. This is the police officer's wife and family. The Invisible...