On November 22, however, before surrendering possession of the rifle to the FBI Laboratory, Lieutenant Day of the Dallas Police Department had "lifted" a palmprint from the underside of the gun barrel "near the firing end of the barrel about 3 inches under the woodstock when I took the woodstock loose.  "Lifting" a print involves the use of adhesive material to remove the fingerprint powder which adheres to the original print.  In this way the powdered impression is actually removed from the object.  The lifting had been so complete in this case that there was no trace of the print on the rifle itself when it was examined by Latona.  Nor was there any indication that the lift had been performed.  Day, on the other hand, believed that sufficient traces of the print had been left on the rifle barrel, because he did not release the lifted print until November 26, when he received instructions to send "everything that we had" to the FBI.  The print arrived in the FBI Laboratory in Washington on November 29, mounted on a card on which Lieutenant Day had written the words "off underside gun barrel near end of grip C2766."  The print's positive identity as having been lifted from the rifle was confirmed by FBI Laboratory tests which established that the adhesive material bearing the print also bore impressions of the same irregularities that appeared on the barrel of the rifle.