ROCKLIN, Calif. (January 3, 2013)—A teenage California girl and her friend used a prescription sleeping medication to spike the milkshakes of the girl’s strict parents so they could log onto the Internet, police said.

The parents called police and the 15-year-old Rocklin girl and her 16-year-old friend were taken to Juvenile Hall.

The girls offered to pick up milkshakes at a fast-food restaurant for the parents of one of the girls on Friday night.

The drug was mixed into the shakes and the couple fell asleep.

The suspicious parents picked up a drug test kit the following day.

The girls told investigators they wanted to use the Internet, which was shut down daily at 10 p.m.

It's unclear what the girls did on the Internet.