Wall

The border patrol uses various means to capture illegals. They include cargo scanners, ground scanners, aerostats (blimps), radio and cell phone tracing, drones, fixed surveillance towers, mobile surveillance , biometrics, patrol boats, planes and helicopters, satellite surveillance, drug sniffing dogs, isotope detectors, night vision goggles, and walls and fences. Biden says we don't need the wall. Some suggest this is merely an anti Trump move.