Chicago ? A month after the killing of a masseuse who advertised on Craigslist, the classified ad site announced plans Wednesday to eliminate its “erotic services” category and screen all submissions to a new “adult services” section before they are posted.

Law enforcement officials praised the move as a victory against online prostitution, but they acknowledged doubts about whether the changes will curb the practice.

“I’m not going to take their word for it. We want to see action,” said Dan Gallagher, an attorney representing Cook County Sheriff Tom Dart, who sued Craigslist in March, accusing it of being the nation’s biggest source of prostitution.

The announcement marked a significant policy change for Craigslist, which in the past has never pre-screened ads, choosing instead to remove them only after receiving complaints. The new adult services ads will also carry a fee.