Police also found damage to the vehicles parked outside, as well as broken flower pots and a wheelbarrow, the report said.
Yarborough was arrested on suspicion of obstruction of justice.
Later Tuesday, a body was found in an unincorporated area of nearby Dorchester County, WCBD-TV reported. Dorchester County Coroner Paul Brouthers identified the body as Karen Yarborough and said she was the victim of an apparent homicide. An autopsy is scheduled for Thursday morning.
Stan Yarborough was principal at Summerville High School from 1994 to 1998 and then was Dorchester District 2 facilities director from 1998 to 2002 before retiring, The Post and Courier reported.