Mr. Eisenberg. Mr. Mandella, do you have any opinion concerning the ability to determine the freshness of a fingerprint?
Mr. Mandella. It is very difficult to tell. However, you can determine if it was left within say a few days, but certainly you can't pinpoint it. You can't say it was there so many hours or so many days. How many days I don't know, but in the developing of fingerprints we will say on an ashtray on this Commission desk here, if we just touch it now, as opposed to a fingerprint being left there several days ago, the impression that we recently left, as we applied powder to it to bring it about would naturally come out sooner because of the freshness of the oils on our fingers.
The others would come out, if we kept processing or powdering it with a brush. They would later come out too. So this is the only indication to me then, that the first ones that appear then were recently left. And in this you can't even say this definitely either. It is very difficult because at certain times it could be a little more oil on someone's fingers and this could last longer and appear to be fresher. So it is very difficult to tell positively.
Mr. Eisenberg. What you are describing is freshness, relative freshness, between one print and another, rather than absolute freshness of any given print?
Mr. Mandella. Yes; that is true.
Mr. Eisenberg. Now I give you Commission Exhibit No. 139, which is a rifle, and ask you whether you think if you developed a print on a steel portion of the rifle you could testify as to whether this was a fresh or a stale print?
Mr. Mandella. No; I couldn't tell. I couldn't tell especially on steel or on wood here whether it is fresh or not. By itself of course too, with nothing around it, you couldn't tell. It is impossible, as a matter of fact.
Mr. Eisenberg. I hand you Commission Exhibit No. 649, which consists of a piece torn off of a cardboard type of box, and appearing on that is a powder impression under a tape, of which you have seen actually a photograph, Mr. Mandella.
Mr. Mandella. Yes.
Mr. Eisenberg. If you had developed that impression, do you think you would testify as to relative freshness?