Final answer:
The most frequent reason for revocation or suspension of a nurse's license is Alcohol or drug abuse.
Step-by-step explanation:
The most frequent reason for revocation or suspension of a nurse's license is Alcohol or drug abuse. Substance abuse among nurses is a serious issue that can lead to impaired judgement, compromised patient care, and potential harm to patients. It is important for nurses to seek help and support if they are struggling with substance abuse.