Simple solution is surely to put some Albion Stewards at the away game turnstiles and then check Tickets against ID
As long as the Club tell people they will be doing this at all future games then it cuts out the Ines who sell there tickets to mates and also if they were given some sort of hand held scanners they could also verify that you attended the game
Man Utd were going to do this. It went down like a lead balloon with the fans themselves.