Cheating over the board happens frequently enough that tournaments are held with very tight controls, but monitoring is off in places like the bathroom.
I know she didn't cheat, but she was accused and has shared the story several times. I thought it was more recent then that, but I suppose it just means I'm getting old.
A better example is Rausis from a couple of years ago — https://www.theguardian.com/sport/2019/jul/13/igors-rausis-c...
Cheating over the board happens frequently enough that tournaments are held with very tight controls, but monitoring is off in places like the bathroom.