Whatever technology the government ultimately decides to adopt, I would encourage that they undertake to very carefully engage a third party researcher—a scientist or somebody appropriate—to do a controlled experiment of that technology, because one of the things about technology is that it is big business.
All the technology companies that design and market security technology are in the business to make money. They will tell you that their security technology is effective, much as Taser/Axon talked about their weapons as non-lethal, and then “oh, shock of shocks”, they found out that actually maybe they're less lethal. They had to change the marketing a bit, right?
Security technology firms want to make money. They will tell you that the technology is effective. If you don't follow through and do your own studies, you're relying on their marketing teams to tell you how the technology works.