So there is a benefit to toilet licking, then. This is why club owners spray a thin coating of WD40 on toilets.
https://www.reddit.com/r/todayilearned/comments/hl8n0b/til_that_in_2005_a_group_of_reporters_swab_tested/
origin - https://www.pipiscrew.com/2020/07/til-that-in-2005-a-group-of-reporters-swab-tested-46-bathrooms-in-the-eu-parlament-for-traces-of-drugs-41-of-them-tested-positive-for-cocaine/ til-that-in-2005-a-group-of-reporters-swab-tested-46-bathrooms-in-the-eu-parlament-for-traces-of-drugs-41-of-them-tested-positive-for-cocaine