Journalist job required revealing facts but truth is not desirable by all ,that's why in many cases it's hard to reach the truth especially when it cames to crimes, suspicions of corruption, political issues... Where all kinds of evidents are buried (reports, records..)
So here where the role of investigate journalism came .the journalist will found himself turning to an investigator to uncover the truth is not an easy job because it may takes years to reach it or it could exposure him to risks such as prison or even death