This guy works at Princeton but he travels all over the world apparently. He's distributing child porn on the internet and likely got it and traveled over state lines with it and maybe even abused children all over so it makes sense federal agents would be involved. I'd expect it to be FBI. It's not clear to me what DHS does. I think DHS was just created after 9/11 for making coverups easier, and to just profit with corruption, giving taxpayer money to connected pals. And to get rid of govt unions. It's possible or likely FBI is involved too even if not mentioned in the news article. Every Ivy League professor or higher up is a pedo, so if this guy is really arrested going down for this he must have pissed someone off. Or it's just possible that an actually good cop is doing his job for once.