It's super illegal to set traps for humans in most of the U.S., I'd be reluctant to use this.
A friend of mine who got some kind of criminal justice degree did some research about setting traps. He told me that the main reason anti trapping laws were passed was to protect the police. I think you point about what would happen if a the authorities had open one of these or even if they just got caught in the blow back is a good worst case scenario. I'm pretty sure if they knew what they were dealing with they'd call out the bomb squad for shits and giggles. If the company who makes this lock would guarantee coverage of all legal fees incurred by the normal use of this product than maybe I'd think about it. It's one thing to say you looked into it and it's allllll goooood, and quite another to put your money where your mouth is.