Finding this cheater required a less-than-subtle stall peak

ChessBase again reported on a cheater from 2002 about a young chess cheat who was found out in probably the weirdest way, before of course we started to see chess moderators literally checking rectums for any hidden device.
During the 2002 Lampertheim Open players began suspecting their opponent, a man who has only been identified as W.S. from L, of cheating as he would leave the board multiple times to go to the bathroom. According to the tournament arbiter’s account, he watched W.S. play very rapidly before going to the bathroom.
“I followed him and could hear no sound coming from the stall,” the arbiter reportedly said. “I looked under the door and saw that his feet were pointing sideways, so that he could not have been using the toilet. So I entered the neighboring stall, stood on the toilet bowl and looked over the dividing wall. I saw W.S. standing there with a handheld PC which displayed a running chess program. He was using a stylus to operate it.”
There are even pictures of W.S. sitting on the closed toilet. When the cheat noticed he was spotted he then picked up an umbrella, opened it and tried to hide himself. Of course, it didn’t work.