On forensically tested whispers certain individuals are heard to be whispering about giving Srila Prabhupada poison. In the IRM paper it is said:

IRM: To use Srila Prabhupada’s own words is a powerful and convincing approach since every devotee knows the strongest possible evidence are the words of the acharya. Such directly revealed evidence is conclusive since it is beyond the four defects. Even supposedly water-tight forensic evidence has to take second place to the words of the acharya, since so called scientific evidence will naturally fall prey to those four defects....The so called 'whispers' can only be used as supporting evidence once poisoning has itself been proven. Thus they have no role to play yet. (It is also worth noting that in any case the poison proponents themselves admit that the forensic tests on the whispers have a margin of error of up to 20%. Please note that in standard scientific tests that can be put forward as any sort of proof, such as DNA testing, the margin of error is usually as low as 0.0001%, or one chance in a million).

Whether or not there is an margin of error on forensic tests, Srila Prabhupada's senses are perfect and beyond the errors of a conditioned soul. He says "I do not know, but it is said."  We can accept it as a fact after hearing from the perfect source, that there were talks (whispers) of Srila Prabhupada been poisoned. Therefore there is an error margin of ZERO !