I think that the first questions that Sherlock Holmes would have asked if he was investigating cold fusion would be...
Who did experiment and where did they bury the body?!
It is very easy to show that if cold fusion with reported excess heat was real, there would have been quite a few fatalities, given the lack of precautions in such experiments.
Human lethal dose is 5..10 Sieverts, equivalent to or 5..10 Grays of gamma radiation, i.e. 5..10 joules per kilogram.
1 Gray = 1 Joule of absorbed ionizing radiation per kilogram = 100 Roentgen.
Neutron radiation does 5..10x more damage than gamma radiation, so lets assume it takes 1 Gray of neutron radiation to kill, or at very least, seriously hurt human. Suppose that experimenter weights 100kg, that'll be 100 joules of absorbed neutron radiation.
Most of the deuterium-tritium fusion energy is released in form of neutron radiation, which is somewhat poorly absorbed by electrolysis cell.
You see where its going. Excess heat output of 1 watt means 3600 joules per hour, which means that there is real risk for experimenter to absorb lethal dose and die, or less dramatically, to get sick. The doses, even for short experiments, would easily exceed yearly allowance for nuclear industry workers. Worse yet, neutron activation would make equipment and walls of building themselves radioactive.
Interestingly, even one milliwatt of fusion power would make regular four-digit geiger counter that you can buy on ebay (and which counts 10 clicks a minute on background) quickly overflow and beep its "run for your life" alarm.
The conclusion is... either there is massive cover up of many deaths, or cold fusion is a hoax.
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