Would make sense you would think wouldn't it?
How about drug tests should be made compulsory before a fight takes place.

For example..... every fighter would be randomly tested anywhere from 3 months to 1 week before every fight they have? Surely that would help weed out the drug cheats? then again that would be an awful lot of drug testing so maybe every fighter would need to be randomly drug tested at least one in every 5 fights or something?