There are a lot of businesses that could be brought down through the seizure of their datacenter, if even only for a few days. It could be something like an IP address in some log, connected with a kiddie porn. The authorities could easily concoct such a thing
after they seize the center, then backtrack, later saying that the log entry turned out to be faked by the real criminals hiding their tracks. In the meantime, the business has been completely inoperative, it's websites utterly gone.
I could envision a corrupt branch of the FBI doing this on the behalf of an organized crime group.
There should be guidelines for the seizure of a datacenter, as this constitutes the ability to destroy a business, especially in cases where high availability is critical. (Often the entire center doesn't have to be seized, only access granted to forensic specialists while access by employees is severely restricted.)