I hope readers don't feel I talk too much about the Think Secret case, but it is truly one of the most misunderstood and controversial things to ever hit the Mac Community.
Here is another example I was able to come up with:
Two years back I bought a Newton 2100 from a Pawn Shop. Two days later, I was called and told I had to surrender it or reveal the new owner if I didn't have it. Pawn Shops are responsible for their items and the purchaser agrees to surrender the item if SUBSTANTIAL evidence can be provided that it was stolen or someone else's property.
In my case, I bought it within hours of it coming out. Someone else had seen it and notified the original owner that one was in a pawn shop.
There are many precendent laws that Think Secret has to deal with.