A national debate has played out over mass surveillance by the National Security Agency. [Meanwhile], a new generation of technology ... has given local law enforcement officers unprecedented power to peer into the lives of citizens. The powerful systems also have become flash points for civil libertarians and activists. This is something that's been building since September 11," said Jennifer Lynch, a senior staff attorney at the Electronic Frontier Foundation. "First funding went to the military to develop this technology, and now it has come back to domestic law enforcement. It's the perfect storm of cheaper and easier-to-use technologies and money from state and federal governments to purchase it." But perhaps the most controversial and revealing technology is the threat-scoring software Beware. As officers respond to calls, Beware automatically runs the address. The searches return the names of residents and scans them ... to generate a color-coded threat level for each person or address: green, yellow or red. Exactly how Beware calculates threat scores is something that its maker, Intrado, considers a trade secret, so ... only Intrado - not the police or the public - knows how Beware tallies its scores. The system might mistakenly increase someone's threat level by misinterpreting innocuous activity on social media, like criticizing the police, and trigger a heavier response by officers.