Four Southern California residents heading home from a trip to Humboldt County were pulled over early Sunday morning by CHP officers who found loaded guns and drugs in their car, authorities said.

The four were held Monday in the Sonoma County Jail.

CHP Officers Cyril Ruffin and Michael Ball stopped the 2013 Fiat 500 heading south on Highway 101 into Santa Rosa at about 12:20 a.m. Sunday.

The car had been weaving and officers couldn't see the registration sticker because it was covered, CHP Sgt. Allan Capurro said.

The officers smelled marijuana in the car, which led to a search. They found about 15 pounds of marijuana and packaging bags in the trunk.

The search also turned up three guns: An AK-47 rifle, a loaded .25-caliber semi-automatic pistol and a loaded .357 revolver, Capurro said.

In addition, Ruffin and Ball found about $100 in fake money, three grams of methamphetamine and a scale.

The officers arrested the driver, Kimberly Garcia, 18, of La Mesa, and passengers Kennan Holt, 19, of San Diego; Brady Bell, 32, of Spring Valley; and Fredrick Norwood, 28, of Southern California.

Garcia, Bell and Holt were being held Monday in lieu of $30,000 bail. Norwood was held without bail because of a parole violation. All four were arrested on two felonies involving selling marijuana.

Bell also had a felony count of narcotics possession, while Holt and Norwood had a felony count of possessing a concealed gun.

"They all claimed they went to Humboldt to visit friends. They were coming back with a bunch of drugs and guns," Capurro said.