On December 23, 2005, an FBI official verified that the US government had been monitoring radiation levels at hundreds of Muslim businesses, homes and places of worship across several major metropolitan areas. The government undertook this monitoring program on the belief that, since it was measuring radiation in the air from public thoroughfares, no warrants were needed. However, Kyllo v. US, which held that thermal imaging scans from public vantage points were unreasonable searches under the Fourth Amendment, spooked the FBI, which subsequently curtailed this radiation monitoring program.
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