Wichita police say a concerned citizen called them at around 4:15 Sunday afternoon.
When police showed up, they found two adults, 31 and 22, and a three-year-old girl. asleep in the car.
The officer woke them up and found that the adults were under the influence of heroin, which they had used while the youngster was in the car with them.
The two adults were booked into the Sedgwick County Jail. The girl was placed into protective custody and taken to a children's home.
No one was hurt.
In a separate incident earlier in the day, police were called to a home in N. Wichita after someone saw three young children playing without adult supervision.
Wichita police found the boys, ages three, six and seven, playing outside in the cold without any adults around in the 1000 block of N. Oliver. Police tracked the boys to a home a block or two away in the 900 block of N. Pershing, where their 26-year-old mother was passed out in the basement. Police believe she was intoxicated.
Police talked with the mother and decided to put the boys in protective custody. Detectives and the Department of Children and Families are checking into the situation. No one was hurt.