THE PRESIDENT: Will you repeat this oath after me:

I, citizen of the U.S.S.R.—called as a witness in this case—solemnly promise and swear before the High Tribunal—to say all that I know about this case—and to add and withhold nothing.

[The witness repeated the oath.]

THE PRESIDENT: You may sit down.

MR. COUNSELLOR SMIRNOV: Witness, just before questioning you, I beg you to adhere to the following order. After my question, please pause in order to allow the interpreters to make the translation, and speak as slowly as possible.

Will you give the Tribunal very briefly some information about your scientific activity, and your past work as a medico-judicial doctor.

PROSOROVSKI: I am a doctor by profession; professor of medical jurisprudence and a doctor of medical science. I am the Chief Medical Expert of the Ministry of Public Health of the Soviet Union. I am the Director of the Scientific Research Institute for Medical Jurisprudence at the Ministry of Public Health of the U.S.S.R.; my business is mainly of a scientific nature; I am President of the Medico-Judicial Commission of the Scientific Medical Council of the Ministry of Public Health of the U.S.S.R.

MR. COUNSELLOR SMIRNOV: How long did you practice as a medico-judicial expert?

PROSOROVSKI: I practiced for 17 years in that sphere.

MR. COUNSELLOR SMIRNOV: What kind of participation was yours in the investigation of the mass crimes of the Hitlerites against the Polish officers in Katyn?