This presentation by Angie Pitt, a PhD student at King’s College London, will explore the relatively new and sensitive phenomenon of impostor participants in qualitative research: those who fake or exaggerate their identities to take part in paid research. Angie will share her experiences from a recent qualitative study exploring adolescent attitudes to vaccines where around 80% of potential participants were judged to be impostors, largely adults posing as teenagers, and explore the questions this raised.