Obstruction of Justice epilogue

Two teenagers stumble upon a major drug smuggling operation. The boys are brutally murdered and their bodies placed on railroad tracks to give the appearance of a train accident. Soon, crime scene eyewitnesses vanish and investigations are shut down. The grieving parents are stunned. Corruption involving high level officials from Arkansas to Washington is documented in this incredible true life story. Why were numerous county, state and federal government investigations blocked? Why was a thirty month federal-grand-jury investigation abruptly shut down. Why did the FBI tell one boy’s grieving parents, “You should accept the fact that a crime has not been committed?”