I've been dealing for close to 10 years now and the first thing I do when leaving a table is wash my hands. Some of the things I've seen done with chips I can't begin to mention on this board. I've seen people throw up on chips, they get sneezed on everyday, people drool on them. Just last week I had a guy stick his finger about an inch in his nose and then pick up his chips and ask for a bet. The very last thing I'd be worried about in table worn chips is a little lead.