Here's an informative article on the use of break away snares for wolves to prevent the capture of moose and other ungulates . In WI cable restraints or live catch snares have to utilize a break away as well, although different than the ones in this publication it has the same effect when accidentally snagging a deer in which the cable opens up. I will post some pics later of a WI legal cable restraint or break away snare.
(note: In WI. first time trappers have to take a mandatory Trapper Education course put on by the WI Trappers Assoc. and WDNR)