Final answer:
The pooling of blood on the backside of the deceased suggests that either the body was moved postmortem or the individual did not die in their sleep. This condition, known as livor mortis, reveals postmortem manipulation if it does not align with the known sleeping position.
Step-by-step explanation:
The pooling of blood on the deceased individual's backside, observed during the postmortem examination, indicates that livor mortis had set in while the body was facedown. Livor mortis, or postmortem lividity, refers to the settling of blood in the lowermost parts of the body due to gravity after the heart has stopped pumping. If the individual was known to have slept face-up, the presence of lividity on the back indicates either that the body was moved after death or the individual did not die in their sleep as presumed.
Typically, livor mortis begins to become fixed between 8 and 12 hours postmortem. Thus, the information about blood pooling reveals a discrepancy in the position of the body at the time of death compared to its known sleeping position, suggesting possible postmortem manipulation of the body.