I know the article stated the cam had "night vision", but it sure looks like the barn lights were on to me. Why didn't they get a cam before the police suggested it recently? After the first attack, I'd have had a cam in there the next day! I'd also have a way to monitor the sounds in there, either via the cam or a baby monitor of some sort - the GS watchdog had to have at least gotten off a few barks before that depraved waste of air killed him.
As for repeat "performances", I'd not only have had a cam in there, but I'd be staking out the barn myself, armed with the means to detain until police arrived.