This is a pretty bad article. Their expert isn't: "Butler, at the University of Florida, said making an IP address that appears to come from elsewhere isn't that complicated." And the legal analysis is weak, but that's apparent from the title: "Experts: evidence to support search warrant on Rebekah Jones' home flimsy" Yes, search warrants are to search for evidence. If the evidence wasn't flimsy they'd have had an ar…
The main problem I have with the article is that it's factually incorrect about it being easy to spoof an ip address in a situation like this. It's easy to send off a fake ip address if [1] your ISP permits spoofed ips (which it shouldn't) and [2] you don't care about a response. But in this case the user had to actually log into the system, which is pretty tricky to do with ip spoofing. (There is some debate about it potentially just requiring an email to be sent to a mailing list, but even SMTP requires various responses).
Given the level of technical difficulty to do this, it seems extremely implausible that someone would go to all that effort just to send out this message.