The problem with transmutation evidence, especially when detected through SEM and where products are natural, is that it is difficult to show that the results are not due to some contamination, or (in the case of isotopic variation) due to some isotopic separation effect.
There could, I agree, be clear transmutation evidence. For example excess tritium is good because contamination is unlikely (except from labs that have worked with tritium or rivers downstream of power stations etc). Having said that - in electrolysis over a long period with liquid added or electrolyte volume decreasing we maybe get natural concentration of T in the electrolyte due to the fact it is 3X heavier than H an therefore less likely to leave the liquid?
95% of the evidence I have seen however is not clear in this way. For example Cravens laser. (Could discuss it elsewhere).
Because contamination or isotopic concentration (remember CF (LOL) bulbs) is usually difficult to rule out transmutation evidence goes into the "uncertain" end of the spectrum most of the time.