I didn't check your links in the article but an article I posted about this on another website said some police departments are handing them out but the homeowner is not obligated to let the police see the video unless that person wants to or are served with a warrant. Then there's the old adage you have no expectation to privacy rights while you are in the public square, this means on someone's property that is not yours, a sidewalk, street or anywhere considered public. I'd be a lot more deeply concerned about facial recognition technology that seems to be on the rise over the door bell issue. The article I posted also agreed with what was stated here, the places they are being handed out to don't necessarily have high crime rates to begin with. You'd think they'd start with the worse area's first.