e7.0 The things that nullify one's ablution (Hadath)
e7.4 The fourth cause of minor impurity is touching human private parts with the palm or inner surface of the fingers only(N: i.e those parts which touch when the hands are put together palm to palm), whether one touches the private parts:
(1) absentmindedly;
(2) without sexual desire;
(3) in the front or rear;
(4) of a male or female;
(5) of oneself or another, even if deceased, or a child;
-but not if one touches them with one's finger tips, the skin between the fingers, with the outer edge of the hand, or touches the corresponding parts of an animal.
e7.5 Ablution is not nullified by vomiting, letting blood, nosebleed, laughing during the prayer, eating camel meat, or other things (N: not discussed above).
e7.6 When certain that a minor ritual impurity has occurred, but uncertain whether one subsequently lifted it (N: with ablution), then one is in a state of minor ritual impurity (A: because in Sacred Law, a state whose existence one is certain about does not cease through a state whose existence one is uncertain about).
When certain that one had ablution, but uncertain that it was subsequently nullified, then one still has ablution.