Code of Federal Regulations Title 31. Money and Finance–Treasury § 31.501.734 Introducing prior sworn statements of witnesses into the record

(1) The witness is dead;

(2) The witness is out of the United States, unless it appears that the absence of the witness was procured by the party offering the prior sworn statement;

(3) The witness is unable to attend or testify because of age, sickness, infirmity, imprisonment or other disability;

(4) The party offering the prior sworn statement has been unable to procure the attendance of the witness by subpoena;  or,

(5) In the discretion of the Administrative Law Judge, it would be desirable, in the interests of justice, to allow the prior sworn statement to be used. In making this determination, due regard shall be given to the presumption that witnesses will testify orally in an open hearing. If the parties have stipulated to accept a prior sworn statement in lieu of live testimony, consideration shall also be given to the convenience of the parties in avoiding unnecessary expense.