 Further evidence against Trifa was a postcard addressed to Nazi leader Heinrich Himmler and signed by "Viorel Trifa".Trifa denied ever writing it, but, using imaging techniques, American forensic scientists managed to recover a latent fingerprint identified as belonging to him.The Israeli prosecutor Gideon Hausner pressured for the extradition of Valerian Trifa so that Israel could try Trifa for crimes against humanity, and famed Nazi hunter Zev Golan was instrumental in coordinating between the Simon Wiesenthal Center and Israeli Police in seeking a trial, but the Israeli government never made any official extradition claim, nor issued any warrants.