This one-hour workshop will offer a brief overview of AI in education, with a focus on graduate teaching assistants' roles in grading and detecting students' misuse or overreliance on AI. It will cover key ethical issues like intellectual property, privacy, data security, and bias, while emphasizing grading integrity and personalized feedback. Participants will learn how to identify over-reliance and misuse of AI-generated content and guide students toward responsible AI use. Practical strategies for supporting student learning and incorporating AI ethically will be highlighted throughout.