@Walter Hinteler,
That's what is called 'overkill' of a problem that's based on fear.
They have lost all sense of balance in their pursuit of locating terrorists.
Here's a link that covers the subject of "Preventing Crime" with some common sense solutions.
https://www.ncjrs.gov/works/wholedoc.htm
There are some acts of violence that will never be predicted by any form of surveillance. THAT'S A FACT. Most acts of violence are perpetrated by people with guns, but gun ownership is guaranteed by our Constitution.
Although studies show that there is an increase in gun ownership, crimes with guns are down. That's the wrong analogy to look at; the number of violent crimes and accidents with guns are too high whether it's on the decrease while gun ownership is on the increase.
If there were no guns, those gun violence would be zero.
What does matter is that the US has the highest gun ownership as well as the highest incidence of gun violence of any other country. THAT'S THE ISSUE.
From abc news.
Quote:U.S. Has More Guns – And Gun Deaths – Than Any Other Country, Study Finds