Is it AI?
Your expertise as a teacher is the best determinant of authentic student work. Designing tasks with built-in ways for students to show their progress will help avoid issues. At the end of longer tasks, students should have evidence of their thinking along the way.
If you suspect inappropriate use of AI, do not engage in a power struggle because it can be hard to prove. Rather, require another method to determine the student's level of understanding - probably something brief, in person, and/or handwritten.
Tools to detect AI language
Using AI & ChatGPT Ethically
via Turnitin.com - Resources for how to use AI in the research process
How to Cite from ChatGPT or other AI tools
Use Noodletools
See - Appendix 6: Guidance on the use of artificial intelligence tools
Via Turnitin.com