I'll have to toss that one out to real attorneys. Normally no, I believe, but I am told that there are conditions under which even unsworn testimony is subject to that charge, and I don't know if this is one of them. FReeper lawyers?
Another crime is "false statement."
Casual vernacular tends to either conflate the two, or incorrectly assume that absence of swearing results in absence of criminal offense.
Mr. Simpson, you should understand that
although the interview is not under oath, by law
you are required to answer questions from Congress
truthfully. Do you understand that?
MR. SIMPSON: Yes.
MR. DAVIS: Specifically 18 U.S.C. Section
1001 makes it a crime to make any materially false,
fictitious, or fraudulent statement or
representation in the course of a congressional
investigation. That statute applies to your
statements in this interview. Do you understand
that?
MR. SIMPSON: Yes, I do.
MR. DAVIS: Witnesses who knowingly provide
false statements could be subject to criminal
prosecution and imprisonment for up to five years.
Do you understand this?
MR. SIMPSON: Yes, I do.
MR. DAVIS: Is there any reason you’re unable
to provide truthful answers to today’s questions?
MR. SIMPSON: No.
MR. DAVIS: Finally, we ask that you not
speak about what we discuss in this interview with
anyone else outside of who’s here in the room today
in order to preserve the integrity of our
investigation. We also ask that you not remove any
exhibits or other committee documents from the
interview.