Yes, to some extent, Big Brother, can see through walls. The Massachusetts Institute of Technology, at the Lincoln Laboratory has developed new radar technology that allows technicians to see through a solid wall.
The 8.5 feet long device consists of an array of antennae arranged in two rows. It is mounted onto a movable cart that can stand at a range from 15 to 40 feet from the location being observed.
Researcher and leader of the project, Dr. Gregory Charvat, said the technology was developed so it could be used by U.S. soldiers in war. “It can be powerful during military operations especially in urban combat situations,” he said. He said his vision is for soldiers to mount the device inside of a vehicle and use that as a sort of command center. The vehicle would then be parked around the corner or across the street from the target.
Only moving images can be detected. They appear as red blobs moving about the screen. The researchers are currently working on a detection algorithm that would convert these red blobs into a cleaner image. 
Big Brother will use this in war, but the main use will be against civilians, especially once the Tribulation begins. Soon, this gizmo will be shrunk down so it can be carried in a briefcase and operated by one man. It will become a super-tool for Big Brother to spy on Christians, Patriots and dissidents.
DARPA, under request from the Defense Department, is developing technology to detect physiological signs through walls.
Office of the Secretary of Defense/DARPA has this to say:
TECHNOLOGY AREAS: Information Systems, Biomedical, Electronics, Battlespace OBJECTIVE: Demonstrate the ability to collect, localize, and evaluate physiological signals (e.g., heart rate) at distances greater than 10 meters, non-line-of-sight, and through solid objects (walls, rock, concrete, etc.).
DESCRIPTION: There is a need to remotely detect, collect, and evaluate physiological signals of interest. Applications and concepts-of-operations (CONOPs) that would benefit from this capability include, but are not limited to: building-clearing, warfighter health monitoring or battle damage assessment and triage, situational awareness and assessment.
Existing micro-impulse radar (MIR) and ultra-wideband (U) technologies have the capability of detecting heartbeat and respiration at distances up to-8 meters (1) but are limited in at greater distances and in challenging environments, such as penetration through thick or multiple walls, concrete, and RF-noisy environments.
There is interest in counting and localizing the sources of multiple physiological signatures in a cluttered environment. For example, in a building that has experienced a catastrophic event (fire, earthquake, etc.), the detection of survivors and assessment of their medical condition, in addition to their location to within 1 meter accuracy, would improve the likelihood of recovery of personnel and their survivability.
Additionally in a crowded environment it is highly challenging to uniquely identify persons based on collection of physiological signatures, such as electrocardiograms (ECGs). It is possible that high-frequency ECGs or other signals could improve the confidence level in unique identification. Approaches using “on body” sensors that transmit signals to remote locations will NOT be considered. 
This technology would be fantastic for finding people who are trapped under rubble after a natural disaster or on the battlefield. But Big Brother will eventually use this in routine police work to determine how many people are in a building before they carry out any number of plans.
 Tejada, Alicia. “MIT Develops New Radar Technology: Military Could See Through Walls.” ABC News. 10.20.2011.