Precisely OP. Might I suggest: Go to multiple sources simultaneously! If multiple persons know, the greater your chance. And if a group of persons know that each other has awarenews then they might be more inclined to proceed together. If you know how to work them you can rally a group to protect yourself. Send them in paper form the most compelling info but not all of it. Leave them to your promise the rest will be delivered in person. Leave a place date and time to meet further if they want to pursue the evidence. Do this with 3-5 unrelated sources, cop, DA, FBI, and reporter all from unconnected entities. Do some homework on them. Have them all meet at the same place unbeknownst to them and pitch the case from there. Have back ups and plans those are your responsibilities! Do not proceed without caution! Do not wait for them in the open when you meet. Watch them ALL arrive and assemble Then proceed to contact via text with a burner, give em the secondary location to proceed to. WATCH movements once you throw the wildcard if no trail on sources proceed to final meeting area with backup plans routes in place. I know it sounds paranoid AF to do these things but trust me guys we really don't know who we are dealing with. They are everywhere. I suggest escape routes and alternative moves upon arrival to be calculated before you serve the evidence. You must ensure they are alone. Take what you can if you needed it pedes.