Hello,
I made a trip to Laos with a Lao friend.
On the way back, via the Nongkhai Friendship Bridge, I had no problem with immigration, but all the Lao were brought into a room where they were invited to pay 100 bahts.
Is it corruption? My friend Lao thinks so and told me that there were no cameras in that room. Immigration kust asked few questions and required 100 bahts.