An ip address is not good enough to locate someone. If they have evidence beyond an ip address sure raid the house, but if they have no identity evidence beyond an ip address then they need to understand they have no identifying evidence.
Per this article yesterday, MaxMind(a geolocation ip service) lists a farm in Kansas (selected because it is roughly the midpoint of the US) as it's unknown location as a result it is given as the address for something like 600 million ip addresses. The farm's owner has been harassed by several law enforcement agencies and countless vigilantes.