Final answer:
The provided excerpts do not explicitly mention the presence of cyanide in the Jacksons' stomachs, but suggest the possibility of poisoning due to mention of drugging and deceiving families about the cause of death.
Step-by-step explanation:
The presence of cyanide in the Jacksons' stomachs is not directly addressed in the excerpts provided, but it appears that a form of poisoning may have taken place in the narrative described. In the provided text, there is mention of individuals being drugged while asleep, and families being told their loved ones died of scarlet fever, which implies a concealed cause of death. The context suggests deceit and possible murder rather than a natural death due to illness. It is important to approach the text critically, piecing together the narrative to infer what may have happened based on the dialogue and circumstances described.