I don't know. It might just be a scare tactic. If you're not a serious purveyer or user of child porn, I don't think they'd bother with you. Besides, they have your IP logged for this one attempt. That's not a lot of evidence worth prosecuting. Police have more worthwhile things to do. My suggesting, stay away from any sites you might think the police are keeping tabs on for a while. If you keep trying to get this stuff, you'll get the cops' attention.