Indeed.
However, Sollecito's arguments in the appeal on the invalidity and unreliability of the alleged DNA evidence on the bra clasp go beyond the mention of contamination. Here is the text of that section 3.14), from page 14 of the translation:
"Further, the motivational deficiency was blatant with regards to the conclusions of the genetic examination of the bra clasp, with regard to which referral of the proceedings to the United Sections is requested.
Regarding the possible contamination of the sample, the appellate judges ignored the photographic materials included in the court records, which clearly demonstrated possible contamination in the way the clasp was treated, being passed from hand to hand by persons wearing dirty latex gloves.
Moreover, no second amplification was performed on the clasp despite there being a usable portion of the extract, which nonetheless remains actually unused.
Moreover, the clasp, although noted during the first site inspection by the Scientific Police, was left on the floor and remained there for quite some time. It is not true, moreover, that between the initial access and that during which the clasp was at last acquired, that there were only two site searches by the investigators, which were more numerous in reality and on those occasions everything was turned upside-down.
In this regard, no account was taken of the defence's observations and of the conclusions to the contrary reached by the party's consultant, Professor Tagliabracci."