But that disclosure also may teach attentive criminals what to look out for. For that reason, some police keep their gadgets secret. N.C. police said. The more people know about it, the easier it is for people to defeat it and make it worthless. We don't want to compromise our investigations.
Skeptics say the high-tech surveillance gear goes too far.
If cops use it, critics argue, they should get search warrants first to keep it legitimate and protect people's privacy. We think we're protecting ourselves from prying eyes when we go inside and shut the door. Technology threatens the efforts we make to stay private.