It is lawfully obtained so yes, but I can see the defense making a good argument otherwise during trial. You subpoeana employees of the company selling you the

It is lawfully obtained so yes, but I can see the defense making a good argument otherwise during trial. You subpoeana employees of the company selling you the info to testify and have them maybe produce a chain of custody document for which they will be asked if it is accurate under oath. Depends on what is PII, an IP alone isn't PII for example so if it says IP 1.2.3 4 went to badguy.com at <timestamp> there is no PII there but they can subpoeana the ISP once the traffic is deemed to qualify as probable cause to prove their guy had the IP. The difference being they either obtain the IP with some other means and buy data associated with it or use some destination (could be their trap) and buy all info about traffic to it with very specific parameters without a warrant. But I am neither LE or a lawyer.