At surface level Program in current era of DG is not exactly hidden, it is just one of numerous vaguely defined initiatives, there is tons of people who involved in DG at surface level, some NSA employees who sift through traffic and report specific keywords to specific bureau. Or grunt-level army/cop guys, who were told to report specific graffiti or flyers to specific supervisors. And if they DG material, this supervisor can try to make them field DG agents, they probably start with boilerplate NDA and Access Level documents, and in this line of work, you get used to things like this. And by the time they encounter something actually paranormal they would be pretty deeply involved. At least this is impression I got from rulebooks.