A Clyo man who was an Effingham County jail officer has been arrested for the sexual assault of a female inmate. After a six-month investigation, David Williford, 50, was arrested Tuesday afternoon for sexual assault against a person in custody, according to Sheriff’s spokesman David Ehsanipoor. After reports of misconduct in the Effingham County jail, internal and criminal investigations were conducted. Williford resigned in February, Ehsanipoor said. “We will not tolerate any behavior which is not in accordance with our professional standards, “ Ehsanipoor said.