Just to add my two peneth worth, i read millets reply and at first thought he had fair points,
then i agreed that who are we to judge, at the end of the day it is their way of hunting / control and it works for them.
To be honest i wouldnt personaly like to use that drag because i would like to know that the trapped animal was where the trap was set.
It is stated that the experienced tracker would track the animal on the drag, but what if it was trapped earley, left overnight, after a heavey snowfall since being trapped, maybee headed into the trees for cover, got snagged up, possibl