In the 2000s Spencer gained media attention when he converted his ranch on the Arizona and Mexico border into a research and testing facility, seeking low-cost ways to improve border security, such as infrared cameras, aerial drones and motion detectors. Spencer\'s researchers developed a system for greatly improving the sensitivity and accuracy of seismic detectors, called SEIDARM, which he patented and offered for sale to the US federal government. \n', '

In 2001, he started warning of a “Mexican takeover of the southwestern United States,” and made a video titled Immigration: Threatening the Bonds of Our Union, which he delivered to every member of Congress.\n', '

The Southern Poverty Law Center and the Anti-Defamation League have accused American Border Patrol of being a hate group. Spencer disputes this accusation.\n', '

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