"So now he's got a rattlesnake, a stolen vehicle, firearm, and somebody under arrest," said Guthrie Police Seargeant Anthony Gibbs.
Police also found an open bottle of Kentucky Deluxe next to the gun.
To top it all off, a further search of the vehicle led to a canister of radioactive powdered uranium being found.
"When that happens of course, we call in a company that deals with that specifically and it's taken safely into possession," Gibbs said.
"The uranium is the wild card in that situation."
The pair weren't charged for having uranium and a rattlesnake, but Guthrie police are still trying to figure out exactly what the suspects were going to use it for.
Jennings has been charged with possession of a stolen vehicle, transporting an open container of liquor, operating a vehicle with a suspended license, and failure to carry security verification form.
Rivera has been charged with possession of a firearm after a former felony conviction.