Since the terrorist attacks of Sept. 11, 2001, the NYPD has become one of the country’s most aggressive domestic intelligence agencies. A months-long investigation by The Associated Press has revealed that the NYPD operates far outside its borders and targets ethnic communities in ways that would run afoul of civil liberties rules if practiced by the federal government. And it does so with unprecedented help from the CIA in a partnership that has blurred the bright line between foreign and domestic spying.

The US Air Force solicited private sector vendors for something called “persona management software.” Such a technology would allow single individuals to command virtual armies of fake, digital “people” across numerous social media portals.

Nine years after the terrorist attacks of 2001, the United States is assembling a vast domestic intelligence apparatus to collect information about Americans, using the FBI, local police, state homeland security offices and military criminal investigators.

The system, by far the largest and most technologically sophisticated in the nation’s history, collects, stores and analyzes information about thousands of U.S. citizens and residents, many of whom have not been accused of any wrongdoing.

Government agents can sneak onto your property in the middle of the night, put a GPS device on the bottom of your car and keep track of everywhere you go. This doesn’t violate your Fourth Amendment rights, because you do not have any reasonable expectation of privacy in your own driveway — and no reasonable expectation that the government isn’t tracking your movements.

Scientists have read the minds of healthy volunteers using a brain scanner to detect what they were thinking. By placing the volunteers in the scanner after they had been shown three film clips, the researchers were able to tell which clip they were recalling.

The advance brings a step closer the prospect of a “thought machine” to detect what a person is thinking from their brain activity pattern. But the technique is still at an early stage of development and its capacity to discriminate between “thoughts” is limited.