Hard to say how guys cheat without knowing the rules, But most common is yotes shot before the contest.(solution) Temp check the yotes.
Trapped or snared yotes turned in, (solution), check every yote for trap and snare marks.
Yotes shot from the air turned in, (solution) check every yote for buckshot in the top of the back.
Make all yotes "property of the hunt". That way once they are checked in, you can skin one(in ?) right their in front of everyone.
Those are a few things I do, I'm not gonna share everything(you understand I have to keep some tricks up my sleeve to catch cheaters)
Also "DQ" CHEATERS , if you can prove it, call them out, and make an example of them. Make it clear that cheating will not be tollerated.
stick to your guns, if your not confident that you can prove in court that someone cheated, you better let it pass. I was threatened with a lawsuit last year because I "dq'ed" a team. I had the proof, and responded I would see them in court, they were "bluffing", but I had all the proof I needed. It would have just been a waste of my time, but I would have won.
This year, we had no problems, I think mainly because guys know I kill upwards of 150 yotes a year,I know alittle about what condition yotes should be in depending on the circumstances, and I run the hunt, and I am the judge, they also know that I will skin any yote in ?. If guys think they will get caught cheating, they don't normally take the chance.