Frederick police said they found 33 pounds of marijuana in the car of a group of teenage girls on Friday morning.
Police said the car was weaving down Interstate 70.
Police have charged the four teenagers with possession and intent to distribute marijuana. The driver, 19 year-old Summer Rockenbaugh, of Thurmont, faces additional counts of contributing to the delinquency of a child.
The other girls have not been identified because they are minors. They are a 16-year-old from Thurmont, a 17-year-old from Hagerstown and a 14-year-old from Hagerstown. The girls were charged as juveniles with possession and intent to distribute marijuana.
Police estimated that the marijuana has a street value of about $100,000.