I've posted this before and I'll throw it out again, you can accept it or not. I've been using it since 1972 I think. Here's the story.
I grew up in a small coal town in Schuykill Co. There was 1 trapper friend that was always "curious" about "where" I was trapping, it bugged me that he was always trying to horn in on my spots. One day I was walking out of a big laurel thicket and wouldn't ya know it he drives by seeing me walk out, I thought crap, now he knows I have traps here. Sure enough later in the day I see him parked there. I wait till he leaves and find he put in a dirthole out of sight of mine through the laurels but maybe only 40 yards away, not sure if he knew exactly where my set was. I thought I'll fix you so I peed all over his set, totally saturated it. Next morning I had nothing but in his set was possibly the biggest grey I ever saw. I couldn't believe it, shocked!
Well since then I used this with a lot of success. I've tried it and experimented with it literally all over the country and in mexico. Just scratch out an area around a marker so you can see the tracks and try it. I do it everywhere I hunt just for fun to see what is out there. I figure how many times has every fox or coyote approached where someone took a leak, probably around every gutpile, and 99.99999% of the time they were able to visit the spot without any negative consequence. A dog is a dog.
In hindsight of this post I wish I would have done it, but I was going to take a video of me marking the set and then the results, but in better taste opted not to, but I took a couple pics. Here is a set that I marked, I hung that large brown grape leaf on the end of the stick and saturated it, the trap is in the ground under the moss fluff.
The next day the leaf was about 2 feet away, probably the wind but I'm not sure, I rehung the leaf better and saturated it again. This was the result from the day after that.
And a pic of a sample test from last year during deer season.