(AP) -- The ACLU asked the Oklahoma State Bureau of Investigation to launch an investigation on Monday.
It also called for charges to be filed against contractors from Desert Snow, who the ACLU says appear to be impersonating police officers in violation of state law.
In a letter to District Attorney Jason Hicks, the ACLU says company employees have never been certified as Oklahoma police officers but are operating law enforcement vehicles, making traffic stops and detaining people while armed.
Hicks and Desert Snow founder Joseph David did not immediately return phone calls seeking comment.
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Low donor turnout and canceled blood drives across the region after a wave of winter weather have created a blood shortage at the American Red Cross.
Tickets go on sale Friday at 10 a.m. for the April 8 show at the BOK Center.
ODOT officials say road conditions are improving in the Oklahoma City and Tulsa areas but problems linger in Texas.