Here is some information on some high profile boxers who have tested positive lately.
Lucas Browne tested positive for clenbuterol and he was stripped of his title and banned from fighting by the WBA for 6 months.
Luis Ortiz tested positive for the steroid nandrolone in 2014 and he was subsequently banned for 6 months.
Felix Sturm tested positive for the steroid Stanozolol in 2016. Ruling still pending.
Antonio Tarver tested positive a 2nd time for synthetic testosterone.
Dark days for boxing, however this does indicate that testing methods are having success.