(CNN) -- Police in Las Vegas, Nevada, are investigating the discovery of what they said is the deadly poison ricin in a hotel room.

Preliminary tests show the substance is ricin, authorities said, but other tests to confirm it are under way.

Meanwhile, the reason the substance was in the room remains a mystery.
"We don't know who [the ricin] belongs to or why it would be here at this time," said Capt. Joe Lombardo of the Las Vegas Metropolitan Police Department.

As little as 500 micrograms of the toxin -- an amount the size of the head of a pin -- can kill an adult.

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http://www.cnn.com/2008/US/02/29/ricin.hotel/index.html?section=cnn_latest

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