LAS VEGAS — A federal grand jury in Las Vegas has charged a man who was believed to have ricin poisoning with possessing the deadly toxin and weapons.

Tuesday's indictment against Roger Bergendorff lists three counts: possession of a biological toxin, possession of unregistered firearms and possession of firearms not identified by serial number. The charges carry a possible penalty of 30 years in federal prison.

The 57-year-old unemployed graphic designer has been jailed since last week when he was released from a hospital. He was treated after authorities found the toxin in his extended-stay motel room several blocks off the Las Vegas Strip in February.

Federal authorities believe Bergendorff may have manufactured the ricin in storage units in West Jordan.

Authorities allege Bergendorff made the ricin as part of a scheme to hurt unspecified enemies — not a terrorist plot.