>>939066378
Well, the most prolific killers operated at a time when prostitutes and drug addicts weren't considered human so the police would never investigate their deaths and disappearances very hard. Ridgeway was able to just leave his dead bodies out in the open in the woods. And none of the girls he killed were even known to be missing until their bodies were found. Samuel Little, America's most prolific killer targeted fellow homeless women and he would just leave them on the streets. He wasn't arrested until a few years ago and was killing since the 70s.