An analysis is conducted on reports of tritium production and of charged‐particle emission from deuterated palladium and titanium. Possible sources of error are outline and the lack of definitive experiments is discussed. Extensive sets of experiments are reported in which two previously reported results are checked in detail. A search for charged‐particle emission was conducted on deuterated titanium and 6−6−2 titanium alloy that was subjected to cryogenic cycling. Two delta E‐E silicon telescopes were used to count 42 samples for 3–4 cycles each from 84K to room temperature. No charge‐one particles were detected and alpha particle yields of a few counters per day corresponded to background levels. A search for tritium production from 1 mm diameter palladium wire was conducted on 130 electrolytic cells in D2O and H2O, and in 250 metal samples. Several samples associated with one lot of palladium stock showed latent tritium levels well above background. No evidence was obtained for the occurrence of nuclear reactions in the electrolytic cells.