Although boxing should have random blood testing, I don't think the sport not having it is behind other sports.

The NBA, NFL, MLB are the 3 biggest sports leagues in th US but they don't have random blood testing either (I could be wrong on this).

It would be good for the sport to do this though. Btw, since someone mentioned it, Barry Bonds did fail a drug test in the early 2000s and McGwire was seen with Andro in his locker during the '99 season. It just wasnt big news.