These aren't ordinary LEOs.
Ordinary LEOs aren't allowed to do a lot of things that more specialized agencies do.
The IRS stands out as an example of a federal agency that can do things other types of agencies can't
www.ojp.gov
The IRS has the legal authority to order banks, employers, and other institutions to provide information about a taxpayer without having to obtain a warrant from a judge; other law enforcement agencies.
The target of an IRS investigation also has to prove that the IRS
didn't have a reason to go snooping (basically having to prove a negative -- nearly insurmountable considering that obtaining discovery from the IRS on cases is basically impossible)
So, while we're in the process of reigning in the powers of ICE, should we kill two birds with one stone and word this new legislation in a way that reigns in the powers of the IRS as well? Like if they suspect that a rich oil man in Texas is cheating on his taxes via taking certain deductions or claiming to make certain donations, they have to get a warrant from a Texas judge before they can pull his records, and then disclose everything they think they have on him to the rich guy's lawyer before the case moves forward?