I use lure for fox with snares, I have a scent post set. I have not tried it for coyotes yet but I guess I will try now if I can find the right spot for it to maybe work.
I use scents with snares different ways also. there are times and places that they work not a set that I would set every day.

Jonesie can do this by using his DOUBLE LOAD system.
With out his DOUBLE LOADED snare. It wont work.

Not a smear bait on trees but I have had great success putting out bait piles and then coming back a week or so later and setting on the trails they use going to and from them. I prefer to set as far away from the bait as possible. I have had places where I set heavily very close the the bait (back far enough to be legal) and had great success right away. But after a couple dogs get caught too close to the bait the rest won't work it again for a long while. Where as when I can cable them farther away they don't seem to associate the bait with the disapearence of their pack and I continue to pick them off longer. If you can catch them 100 yards away or more it is easier to keep catching.

That's the way to do It.

The snare boxes work better in fur trapping than they do in ADC work. Bob Noonan's martin fisher boxes work, just increase the length. Snared cubbies also work good on fox and coon I bet they would work on cats also if done right. The key for me is the cable has to fire on the stall.