The IRS has broad authority through its summons power when conducting an audit or investigation to obtain and examine information from taxpayers and third-parties. In fact, I.R.C. § 7602 allows the IRS to issue a summons to: (1) a person liable for tax, (2) an officer or employee of such person, (3) a person with possession, custody, or care of the business books of a person liable for tax, or…