said by Khaine 
:And what happens when a new bot comes out that the ISP doesn't scan for and a customer gets infected and sues the ISP for failure to do its job? You know someone would do it.
Currently ISP's are common carriers and don't have any liability for traffic that passes through their network. Buy forcing them to scan users or whatever you could change their legal status and their liability.
I don’t think you understand how to detect a bot. You don’t target each specific type. You target by activity. Ex: set up a firewall and start logging unsolicited traffic. Then shutdown the ones that are obviously bots.
