Regular testing using rapid antigen lateral flow tests (LFTs) was an important prevention strategy during the COVID-19 pandemic. However, falsification of home LFTs was a concern. Using a large quota-representative sample of adults (n = 1295) in England, we conducted a vignette survey consisting of four hypothetical scenarios of LFT falsification behaviours (FBs) to examine whether prosocial personality traits were associated with attitudes towards and intentions for falsifying home LFTs …