On 14 April 2010, Anton Dallmeyer, an expert witness, testified that the typeset and handwriting on an ID card being used as key evidence matched four other ID cards believed to have been issued at the SS training camp at Trawniki. Demjanjuk's lawyer argued that all of the ID cards could be forgeries and that there was no point comparing them. The prosecution also produced orders to a man identified as Demjanjuk to go to Sobibor and other records to show that Demjanjuk had served as a guard there. Demjanjuk's defense team argued that these documents were Soviet forgeries.