Scottish Borders Council has said its checks are working at local libraries after a Galashiels man was convicted of downloading child pornography.
The council reports suspicious internet usage to the police
Andrew Robertson, 25, was jailed for six months and also placed on the sex offenders' register for seven years.
He downloaded 185 indecent photographs of children at his local library.
Robertson originally denied offences which took place over two years. He was caught by safeguards installed after an earlier case at Earlston Library.
SBC cultural services manager, Ian Brown, said the monitoring of internet use was working.
"Following on from the Earlston case we discussed our procedures quite thoroughly with the police and Child Protection Agency," he said.
"We further tightened up on our procedures and our ability to monitor if internet users have been accessing illegal sites."
That resulted in improved computer servers and new software being installed.
"If we come across areas that we are concerned about then the police have been quite clear that we should pass information on to them," said Mr Brown.
"They have the ability to carry out much more detailed checks - that certainly is what happened in this particular case.
"The message is fairly clear - we take the unacceptable or illegal use of internet access really very seriously."