AFP investigators leave the ABC's Ultimo headquarters (Image: AAP/Bianca De Marchi)

Over the weekend, the federal government and its agencies sent an unspoken but clear message to confidential sources -- if your leak suits the government (or its agencies) you’ve got nothing to worry about.

This message came via reports that "due to the limited prospects of identifying a suspect" the AFP was ending its investigation into the front-paged leak of apparent security concerns over February’s Medevac legislation.