Straw is lit on fire. Set is made such that the straw around perimeter does not burn. Leaving the blending of straw over traps that are bedded in dirt or waxed dirt. Not the standard hay set. Sod is turned up on its side, dirt side out. Trap set out front of this. Lure placed to guide feet.
The burn is a great attractor. A couple of other type sets close should produce some of the shy ones. It is neat to watch the smoke trail and see where the scent is taken.
Be smart and be sure to have permission and fire is out before leaving. Get em!