Join Date: Dec 2004
Location: Riding the rails
Programs: Japan Forum, Skyteam Elite Plus, BW Diamond Select, HHonors Gold, NWA, DL, NH
Posts: 1,936
In my experience it depends. Some of the officers stamp the customs form but not the passport, some stamped in a blank area on the visas page and in two other cases they stamped over two of of my older entry stamps from another country.