I heard something similar, cannot confirm. In regards to his upcoming fight with Danny Green I can only express my disapproval. The guy has been through wars both in his Muay Thai days (as a teenager) and as a boxer, and alledged abuse of illicit substances during his "stand over man" period, combined with his 4 year lay off I don't think he belongs in the ring with a natural non-weight drained Green. Prime for Prime he boxes Greens ears off.
I dunno. But what I do know is he should've saved his money from those "days" if its true, because Briggs is obviously in need of $ and is gonna be massacred by Green in july to get it.
There's alot of info in book 'Heart, Soul, Fire." Used to do all types of crazy ****. From memory some stand over work was involved.