How do you know that? Neither Duran nor Robinson was tested during their time and steroids abuse by athletes started in the 1950's so we don't know if Duran used them.
Pacquaio has been taking tests given by USADA and VADA for nearly a decade now and has always tested negative. He even voluntarily signed up for the VADA 24/7 365 day random testing program just to prove he is clean.
In fact I can name a few notable Mexican fighters who have moved up in weight who have tested positive for banned substances during that same timeframe:
Canelo Alvarez
Erik Morales
Orlando Salido
Julio Cesar Chavez Jr
Ray Beltran
Has been tested for nearly a decade and hasn't knocked anyone out in a decade except for the retirement check cashing Matthyse. Kind of strange his power went away overnight.
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