Two men on their way home from the Preakness were charged with driving under the influence after they stopped at a South Carroll service station where Natural Resources Police were buying gas.
One of the drivers also was charged with possession of marijuana, police said yesterday.
The NRP officers said they had stopped at the service station on Liberty at Oakland Mill roads Saturday when they were approached by a Laurel woman, who appeared to be intoxicated and asked where she was.
She told the officers she had accepted a ride from a man who was waiting in a truck nearby.
The officers reported that they questioned the driver, Michael Carroll, 36, of Sykesville, and that he failed a field sobriety test.
Mr. Carroll was arrested, charged with driving under the influence of alcohol and later released.
Police said the woman approached another vehicle, which contained three men, and asked them for a ride to Laurel.
An NRP spokeswoman said the officers became concerned for the woman's safety and questioned the car's driver, Barry Gene Thompson, 31, of Bowie.
Mr. Thompson was given a field sobriety test.
He was arrested and charged with driving under the influence of alcohol.
Officers said they searched that vehicle, found a small amount of marijuana and charged Mr. Thompson with a possession count.
He was later released after posting $1,000 bond.
One of the officers involved in the arrests is an instructor at the NRP Academy on drunken driving and sobriety testing, the spokeswoman said.
The Laurel woman was taken home by police.