Well to get it in perspective -
I spend a lot of my time eradicating foxes from remnant bush reserves. That means every single fox, be it young stupid ones, old ones, smart ones, shy ones, I must get them all.
And I do this from tropical to southern forests, deserts, beaches and urban areas covering an area a third the size of continental USA, so the difference in localities and fox behaviour would be apparent (and so called "in my area" syndrome would clearly show). I use the same general techniques everywhere, varying only the type of trap and the set type.
Now to do that, you would think if I was doing something wrong with human scent, I wouldnt catch the smart, shy foxes. But I catch them all.
I wear work clothes. I get dirty and sweat. I set traps when it's 115 degrees and humid, and I set traps when its cold. I wear shorts when its hot and short sleeved shirt.
I wear the same work boots everywhere and they do just fine. I wear clean gloves, and I dont touch clean traps. I use a kneeling cloth, a hessian bag, most times. I dont let sweat drop directly onto my trap or trap-bed, but otherwise I dont care cos I cant help it sometimes when its "50 in the waterbag".
I have many times spent much too long at a trap site showing someone how to trap.
My trapping tools I use for every type of trap (including remakes) and they get put into my tool box on my 4x4 with all the other stuff I carry around to do all the other work I do.
I am pedantic about how clean my traps are for foxes. I am not quite so much for dingoes. I dont always wax my traps!
I often set traps for foxes for only 1-3 nights and for dingoes 1-5 nights. I dont set traps after 3pm.
I have had many animals shy away from a certain lure, and I have caught them in the next trap.
And looking at my records for the past 7 years (thats all the records I keep), I have caught every single animal, every single time. Now those are facts which can be readily proven.
Put a clean trap in the ground and set it properly. You will get your target animal.
Mike