The tests first became available to order through the federal government last week.
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The man, who recently moved to Las Vegas from Hawaii, won $109,732 at the California Hotel.
A driver reported the man to police. It marked the second homicide that Las Vegas police investigated Sunday.
The Las Vegas Fire Department received reports of an explosion behind Main Street Station, near North Main Street and Bonanza Road, at 9:42 p.m., a spokesman said.