They have already got in to some hot water when they seized a dynamic dns domain that was hosting thousands of subdomains (only one was accused of pedophilia trafficking). They wildcard redirected the domain to an IP that hosts a page saying that domain was seized because the site was hosting pedophilia. Pedophilia labeling was strung across a lots of personal sites, church websites, and radio station websites in the processes. It took days for them to revert it and have all the DNS records propagated but the damage was partly already done as it labeled innocent parties as pedophiles without due process.
Not sure who is doing oversite of the DHS/ICE's efforts here. Probably best not to buy .COM/.NET domains, especially if you register it with US address in the WHOIS.