Test results have confirmed ricin was a substance found in the home of murder-for-hire suspect Preston Rhoads.
A law enforcement source confirmed with News 9 the substance tested 100% positive for the deadly toxin. However, the substance was only found inside the home and police officers were not exposed.
Oklahoma City Police and FBI agents say Rhoads was planning a murder before they searched his home on Thursday. The FBI says it processed his place for hazardous materials after finding the unknown substance, now identified as ricin.
At Rhoads' home on N. McKinley, the health department has posted a sign saying the home is unsafe and warns people to stay away.
Ricin is highly toxic and is produced in the seeds of the castor oil plant. A single dose made up of only a few grains can be enough to kill an adult human.
No other information has been released at this time.
Keep checking with news 9 and News9.com for more information.