A woman was arrested on suspicion of driving under the influence while her 4-year-old son was in the vehicle on Monday afternoon, police said.
Lisa Ann Zutner, 37, was going south on Foothill Boulevard, just north of Hilltop Road in Napa when an officer pulled her over for speeding shortly before 3 p.m. She was going 39 mph in a 25 mph zone, police said.
The officer detected signs of intoxication and had Zutner perform a field sobriety test. Zutner had a preliminary blood alcohol concentration of .23 percent, police said.
She was arrested on suspicion of driving under the influence as well as child endangerment since the boy was in the vehicle, police said. She was booked at the Napa County jail.