What is the ruling on a forensic doctor examining a woman's private parts by judicial order, and does that nullify her ablution? And what is the ruling on autopsying bodies by judicial order, and does that nullify minor or major ablution?

The basic principle is that a woman should be examined by another woman. If no woman is available, then it is permissible for a man to perform the examination out of necessity, limiting his gaze and touch to what is needed. The doctor's ablution (wudu') is invalidated if pre-seminal fluid (madhy) or seminal fluid (maniy) is discharged from him, or if he touches the woman's private parts without a barrier. The woman's ablution is invalidated by touching her private parts without a barrier or by the discharge of any fluid. Dissecting a deceased body is permissible for a preponderant benefit, and it does not invalidate minor ritual purity (wudu') or necessitate a major ritual bath (ghusl) unless its specific causes occur.