Massachusetts Institute of Technology has a Computer Science and Artificial Intelligence Laboratory (CSAIL) where scientists have already developed artificial intelligence software that can help you see the object standing or moving behind the walls. That means walls can’t stop your eye to see through it.
Being called RF-Pose and CSAIL, this technology can identify degenerative diseases but you need to observe the movement in aged people. As this technology can help you see the people standing or moving behind the walls, it can be used for good or bad purpose too. The video is available here
Source: https://www.bbc.com/news/av/technology-44549806/artificial-intelligence-software-sees-people-through-walls