Depends on both degrees of informed and capabilities of the investigator.
It can literally be a full time job however. If you can truly keep up with world news and details with the best essentially any intelligence agency (or large financial institution) would gladly take you on board for a good rate doing perfectly honest and legal work just from being able to piece it all together and make the proper inferences and connections.
Informed or not isn't a binary but a dizzying collection of them that can wind up ironically mixed with things like DNA pioneers pushing megadosing crankery.
It can literally be a full time job however. If you can truly keep up with world news and details with the best essentially any intelligence agency (or large financial institution) would gladly take you on board for a good rate doing perfectly honest and legal work just from being able to piece it all together and make the proper inferences and connections.
Informed or not isn't a binary but a dizzying collection of them that can wind up ironically mixed with things like DNA pioneers pushing megadosing crankery.