I personally think he should be allowed to train, given as much help as possible to help him get on the right road, and resume his career.
I don't understand why sport is possibly the only profession where if you get caught taking recreational drugs, you're barred from earning a living in said profession. People like Hock, Danny Langtree, Matt Stevens, et al, should be helped rather than banished from their profession for two years. It sounds like Wigan, to their credit, have. Performance enhancing drugs is, a different kettle of fish, mind you.