Doping

In someways I think it's quite sad when people feel they need to resort to doping. I feel many end up there as they are trying to, as they perceive it level the playing field. With news of another positive test for Lucas Browne today, how endemic is doping in boxing? Testing is patchy at best and not even always agreed too. What makes someone like Browne think they can get away with it? He volunteered for both testing programs. Heavy weight is littered with those who have served bans. Are the punishments not great enough? What should be done?