Not necessarily, the Nazis towards the end of the war tried to erase as much evidence of the "final solution" as they possibly could. Prisoners were often just numbers at best in the records.
As such its difficult to prove who you were or where you were during that period of time. Even the traditions of tattooing prisoners (and SS men) is not fool proof. Most prisoners (particularly those chosen to die on arrival) were never tattooed with a number, and many survivors had those numbers removed as soon as they could. An SS blood type tattoo also proves nothing beyond you having been a member of the SS, and the SS had many branches, several which had little if anything to do with genocide or other atrocities.
One thing that always concerns me about Nazi war criminal trials, is that they often turn into witch hunts/burnings, where it is near impossible for the person to get a fair trial as most presume the person guilty until proven innocent. Most of the Neuremburg and other trials at the end of the war for example were little more then a farce with a shaky legal basis that was primarily intended to dish out vengeance rather then justice.
This is not to say that I don't believe that the Nazi's did some unbelievably horrific things, or that the Holocaust did not happen. I have in fact done an extensive amount of personal research on the Holocaust, and am quite convinced that it did happen (and roughly in the range of the estimated numbers), particularly after some of the more recent archeological evaluations of some of the death camps (defiantly not pleasant reading material).
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