Once more SLOOOWWWLLY -
The fence is invisible - many times required by communities over visible fences - BUT - the control collar is NOT - it is HIGHLY VISIBLE AND REGCOGNISIBLE...
A cop who panics at a golden, first, and second, doesn't take time to spot such a cumbersome collar - he's likely to panic in a REAL danger situation and shoot ANYone.
GOT IT YET? Can you see this this time?
And just as aside: I come from a 'cop' family and friends background. It's cops like this guy that give good cops a bad name.