But how far should and do the authorities go in online surveillance?

"The government has this information because it wants to engage in surveillance."

The Pentagon says the two men were engaged in legal surveillance.

The terrorism information program is not and never has been intended for use in surveillance against Americans.

There's not a lot there, from what Jimmy in surveillance has to say, but it would be good experience for you.

It may also be important in immune surveillance against cancer.

Due to an increase in surveillance, the police discovered other members of the gang.

It also works in the observation and surveillance of the country's natural resources.

You may not agree, but even being invited to take part in surveillance on this kind of case is a huge responsibility.

But the data could also be crucial in surveillance for biological or chemical attacks.