Patrick Wills was caught cheating at the Rocky Racoon 100 a couple years ago (see links below). Funny thing is that it was the exact same MO, not running an out and back section...
https://www.irunfar.com/this-week-in-running-february-5-2018
http://www.crockettclan.org/blog/?p=4165
https://humanpotentialrunning.com/from-the-rd/cheaters-gonna-cheat-haters-gonna-hate/