Police say imagers make their job safer and more efficient. Police can then use the images to get a warrant from a judge to search inside. Some police agencies announce when they're trying new surveillance technology in an effort to gauge the public's view of their reasonableness and to allay concerns about secret spying on ordinary, law-abiding citizens. But that disclosure also may teach attentive criminals what to look out for. The more people know about it, the easier it is for people to defeat it and make it worthless.
Skeptics say the high-tech surveillance gear goes too far.
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