Chris Perry formerly of South Glamorgan CC denies the charge.
Swansea crown court heard senior child care worker Alan O'Brien, employed at Taff Vale children's home, killed himself in a fume-filled car in 1989. He died hours before police were due to interview him over allegations of gross indecency with a nine-year-old boy at a swimming pool.
Despite evidence O'Brien owned paedophilic material and had made notes in the form of a diary suggesting children had been sexually interfered with, no one at the local authority investigated the possiblity of abuse at the children's home.
'Noone did anything to answer those questions and for their part the police did little better.'
The case continues.