Final answer:
In kickback situations, the investigation technique of inquiry is generally ineffective, as individuals involved are likely to evade or conceal the truth to avoid incrimination.
Step-by-step explanation:
The question pertains to investigation techniques in scenarios involving kickbacks. The investigation technique that usually does not work well in kickback situations is inquiry. An inquiry-based approach involves asking questions and seeking information openly. In kickback situations, which often involve illicit agreements and hidden transactions, individuals are less likely to respond truthfully to direct questioning. Instead, they might evade or conceal the truth to protect themselves and their accomplices.