Last month, one of its officers -- Hilton Botha -- was booted from a high-profile murder case after prosecutors reinstated attempted murder charges against him.
Botha is accused of chasing and firing on a minibus full of people while drunk in 2011. He is charged with seven counts of attempted murder.
He was testifying in the trial of Paralympic star Oscar Pistorius, who is charged with killing his girlfriend on Valentine's Day.
In the case of the taxi driver, the independent investigative agency pledged to be transparent in its findings.