Devin Haney's father Bill Haney, who also serves as his coach, wants Ryan Garcia out of the sport of boxing forever ... telling TMZ Sports he believes the star fighter's flunked drug tests should lead to a lifetime ban.
Bill made the comments to us on Friday ... some 24 hours after Garcia's B-sample came back positive for Ostarine -- a banned substance. His A-sample previously tested positive for the same PED weeks prior. Garcia initially took the tests on April 19, the day before he beat Devin in an instant classic at the Barclays Center in New York.