Any team which has faced a misconduct – and its investigation, faces a negative affect due to loss of trust, possibly change of personnel and through possible self-accusations by other team members. This all has an effect to performance which can increase the cost significantly.
Outsourcing investigation reduces the subject team’s healing time significantly, there is likely to be less harm caused, management is seen clearly to be on the team’s side, there is less second guesses on their fairness and they can concentrate on the healing of team.
Even though a rational mind understands that the highest risks exist before a misconduct has been realized or investigated, The investigator has left, we do not need to be afraid anymore – is a very understandable human trait within an organization.