I have seen the following ad at CL:

These Girls Have Been Verified That They Have Std,Hiv,&Aids - w4m

Date: 2006-08-04, 5:29PM PDT

Then there is the list of names and phone number of girls.

Could this be true?

Of course it could be true, but need to ask. How is it verified, who is posting. Why would I believe you? Have gotten std'd from each and been cured and then gotten it again?
On craigs list you can say anything and it has credibility for some reason.