Remind me never to recycle my plastic shopping bags.
If this is a fair cop, it's good news, but I can think of two or three scenarios (I take food donations to my church in plastic or paper bags) that could result in his prints being innocently on that bag. The child custody work he did for someone later convicted as a terrorist stands out in this regard, and I can think of dozens of ways a shopping bag could have found its way to the terrorist's home.
Waiting for more information.