Answered by Shaykh Sohail Hanif, SunniPath Academy Teacher
Does a drop of urine exiting the body break wudu’?
Yes, if a drop of urine exits one’s body one’s ablution is nullified. This is of course assuming that one becomes aware of it at a later date. If one never saw it or felt it, one assumes that it never came out. Certainty is not lifted by doubt; if one is certain that one performed the ritual ablution, it will not be nullified unless one is sure that it is.
Sohail Hanif
Faraz Rabbani adds:
The sunna is to follow certainty, and to ignore baseless misgivings.