Advance
Vetting
Because so many of our government positions are held by those seeking to advance themselves, we sometimes find that those who run our administration are susceptible to bribes from foreign powers. Running some simple background checks will weed out the officials most prone to corruption.
Advance tree
The game files don’t say where this goes: it has no requires, so the game places it in the 
Discovery tree itself.
Modifiers
Counterespionage+33%