Did Sheikh Muhammad ibn Uthaymin change his fatwa regarding a woman's discharge, stating that it does not invalidate ablution, after a research paper was presented to him by a sister, and is this fatwa available in his own handwriting in the book "Rutubat Farj al-Mar'ah" (Moisture of a Woman's Vagina)?

The statement attributed to Sheikh Ibn Uthaymeen, that wetness does not invalidate wudu, does not appear to be correct. The most he commented on a research paper regarding the topic was that the strongest evidence for non-invalidation is the default rule (no invalidation unless there is proof), and this does not mean that he issued a fatwa to that effect. His audible and written fatwas do not include this statement; rather, he explicitly stated the opposite and denied the truthfulness of anyone who attributed to him the statement that wudu is not invalidated by that fluid. The Sheikh mentioned in Al-Sharh Al-Mumti' that the original state of innocence (of invalidation) is the strongest evidence for non-invalidation, but he preferred the opinion of invalidation, and he did not mention any of the Salaf who held this view. Therefore, this statement should not be attributed to him, especially since he explicitly denied the truthfulness of those who attributed it to him.