Originally Posted by sunrisegirl

The only time I've seen a passenger getting somebody elses BP from the kiosk is when the previous passenger has forgotten to collect it. I've seen the kiosks refuse to give BPs but this is usually when somebody has put an incorrect credit card in or put the passport in the wrong way, but never seen them spit one out for the wrong passenger.

Passengers should not have two boarding passes - for security issues - though I know many people print two or more when doing OLCI at home. Different airports have different procedures for security/passport checks and, although I've been to GVA, not sure how their security systems would deal with that.
I think at LGW if two BPs are presented for the same person, flight, etc it would alert the agent on the security desk.

Oh and welcome to FT!