Final answer:
AD stands for Administrative Detention, which is a safety measure used in prisons to separate inmates from the general population to protect them or others.
Step-by-step explanation:
When an inmate is placed on AD for protection not at the inmate's request, AD stands for Administrative Detention. Administrative Detention is used in correctional institutions as a measure to separate an inmate from the general population for the safety of the inmate or others, often when threats or potential dangers arise within the inmate population. It is not related to matters of alcohol and drug treatment, aviation technology, or legal amendments.