Help. With name or link to a website to check and see if an item bought on Craigslist or the like is stolen

I was watching the news the other day and they were talking about Craigslist and the like and how many items or products sold there is stolen and they mentioned a website whos name I can't for the life of me think of of which you can enter the serial number of the product or item you may have purchased and see if it's stolen by entering the serial number.

I think it's the same site that police also use or at least one of them to check and see if an item has been listed as being stolen.

If anyone may know the name or link to the website it would be greatly appreciated!

TIA