BOA used to give lifetime bans from competing at the Olympics for drug offences until WADA and CAS intervened and said it was unlawful. I think it was after Chambers challenged them because he wanted to try and compete at London 2012I was reading the other day that the lad who tested positive will get a 2 yr ban.
If its proven they should ban him forever. The other 3 will have dreamed about getting an Olympic medal and have had it taken away from them by someone who couldn't hack it without cheating.
I don't doubt that but a lot of people being caught at the moment are doping in very clumsy manners that almost guarantee that they will be caught.It's not bad luck getting caught it's negligence in managing your PED regime/schedule.