CHP officers arrested three people after officers stopped an erratically moving sedan in Santa Rosa and discovered packaged marijuana, hash and a grenade, prompting authorities to temporarily clear the area until bomb investigators confirmed it was a dud.

The three taken into custody were among 17 people arrested throughout the holiday weekend by CHP officers in Sonoma County, according to CHP Officer Jon Sloat.

Officer Brian Wood was on patrol in the area of Hearn Avenue on Friday morning when he saw a Mazda sedan tailgating other vehicles. As the officer drove toward the Mazda, the driver began making evasive turns. Zachary Martin, 29, of Santa Rosa, later told officers he had been trying to avoid the approaching patrol car, Sloat said in a press release issued Monday.

When Martin pulled over the two passengers in his car started to run from the vehicle. They came back, however, following the officer’s order.

Inside the car, the smell of marijuana led to a backpack holding about three pounds of marijuana and hash, apparently packaged for sale, Sloat said.

Officers also discovered a grenade in the backpack and moved everyone out of the area. Passenger Tony Cuellar claimed ownership and told officers the grenade wasn’t live. Bomb detectives later confirmed it couldn’t explode.

Officers arrested Martin on suspicion of driving while his license was suspended, violating his probation and carrying an illegal switchblade-style knife.

Cuellar, 37, of Santa Rosa was arrested on suspicion of having marijuana for sale and violating his probation.

Officers also arrested passenger Elizabeth Sengsourth, 33, of Santa Rosa after finding she had altered checks worth more than $4,500 and stolen credit and Social Security cards. She was arrested on suspicion of possessing stolen property, Sloat said.

At the other end of the weekend, officers arrested a San Rafael woman on suspicion of drunken driving after she’d grabbed the wheel of the car she was riding in.

Cayla Shapiro, 24, was being driven home at about 1:15 a.m. Sunday by a Windsor man who had told her she was too drunk to drive, said Sloat. As they traveled on Highway 101 near the College Avenue exit, the woman yanked the steering wheel and caused the man’s Toyota Avalon to spin into the center divider.

Shapiro confirmed the man’s report that she’d grabbed the wheel, wanting him to take the exit so she could get to her own car, Sloat said.

Grabbing the wheel makes a person in control of a vehicle and Shapiro was arrested on suspicion of drunken driving and for violating her probation, stemming from a February DUI conviction.