No credible witnesses came forward, and there was no surveillance video from the store.
The data was compared with towns that had no surveillance cameras at the time - Chelmsford, Poole, Derby, Scarborough and Huntingdon.
BBC: The study was the first to compare police and hospital data
Mr. Walsh testified the FBI conducted no surveillance on Mr. Valle in the month between the start of the investigation and his arrest in October.
Yet, as the Stasi itself eventually discovered, no system of surveillance can ever produce total knowledge of a population.
Six remained on active surveillance with no evidence their DCIS had worsened.
He says there seem to be no glaring gaps in the current surveillance program.
Congress has no qualms, however, with surveillance infrastructure.
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But while the proposed new legislation would cover phone tapping and mail interceptions, it conspicuously fails to deal with other, no less intrusive, forms of electronic surveillance such as long-distance microphones, laser devices and the placing of bugs.
Both stressed that these would be surveillance drones and said there are no plans yet to deploy them.
In Saudi Arabia, for instance, the government is sparing no expense in building state of the art surveillance systems.
The company would then run surveillance studies to be certain that no unusual side effects arise during its use.
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Although both caveat that these would be surveillance drones and said there are no plans yet to deploy armed unmanned aerial vehicles.
And in its brief, the Justice Department argued that Americans have no right to sue the government for alleged illegal surveillance.
Two days later, Mr. Valle was in the teacher's neighborhood when he had no reason to be there other than to conduct surveillance of his intended victim, Ms. Waxman said.
Surveillance tape late Thursday showed Dzhokhar Tsarnaev, Suspect No. 2, at a gas station.
Tsarnaev, who had appeared in surveillance photos wearing a black cap and was identified as Suspect No. 1, died days after the April 15 bombing, which killed three people and injured more than 260 others.
What allegedly occurred inside the restaurant is no doubt a result of the increasing presence and subsequent awareness of connected cameras, ranging from consumer gear to professional surveillance equipment.
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