In 2025, we received money from the VU's language policy funds to further develop our materials for teachers and students about GenAI tools and writing. One topic that we examined was the question of how teachers can spot texts that are generated or heavily influenced by AI.
There is in fact no guaranteed method to detect whether a text was generated entirely, or largely, by an AI tool, and that includes the use of AI detectors. Indeed, the VU strictly forbids the use of AI detectors because they are unreliable and do not meet the VU's privacy requirements. But knowing some of the common traits of AI-generated texts can help you spot them. These tendencies aren’t inherently bad and can also be present in human writing, so they aren’t a way to detect AI fraud or say that a text is bad writing. And as the technology is continuing to change, so will the features of AI writing. But thinking about these features can help you think about what you value in writing and what kind of writers you want your students to become.
So, we have looked into the research on tendencies of AI writing and created a list of common clues and traits. This list doesn’t represent VU policy. It’s only intended as a helpful aid for teachers. You should always check the university and programme guidelines when thinking about potential AI misuse.
You can find out more about these in our in-depth guide to spotting AI use in student writing here. We are also working on a Canvas course with activities to practice spotting AI writing. Send us an email at alp.sgw@vu.nl if you would like to be added to that course when it is ready.
Here are some clues that a text might have been produced by an AI writing tool:
Linguistic clues
- Repetitive sentence structures
- Repetitive vocabulary
- AI-favoured vocabulary
- A more confident and less cautious tone
- No or very few errors
Structural clues
- Headers
- Uniform text patterns
- Fewer different communicative purposes per text
Content Clues
- Hallucinated sources
- Unexpected sources
- Lower citation frequency
- Emphasis on information instead of argumentation
Qualitative clues
The following clues were identified through more qualitative research and are based on expert and instructor opinion rather than empirical evidence.
- Claims beyond likely student knowledge
- Broad statements
- Inaccurate or fake information
- Not meeting assignment requirements
- Omitting class content
- Bland writing style
- Overly poetic language