Very tough question to answer. What I have found is the answer for the most part is "no". One thing I'm strong on is checking my boxes every 3 three days to be sure the voles, mice, squirells, etc have not cleaned my bait out. This obviously means going up to the box. I have foot tracks all over the snow. This has never stopped cats from being caught, HOWEVER, I have had cats approach within 10 feet or so of my boxes and leave. WHY???? Were they reluctant to approach because of the tracks, did the wing fluttering above the box bring them in out of curiosity, were they just not hungry enough to pproach,did my call lure bring them in out of curiosity, perhaps they were just being typical fickle cats. But overall I will say that foot prints do not bother 90% of the cats. As for human scent, absolutely not. They are not afraid of it. I dont wear gloves when setting my conibears, I bare handed use a stick to spread call lure on my wing and toss it either in the box or on top of it. Little to no attention is made by me when it comes to human scent.
Peace is that brief glorious moment when everybody stands around reloading