Chyna Appeared Drug-Free on 'Botched' for Breast Surgery

Chyna showed no signs of addiction several months before her death ... so were the observations of a doctor who tried to undo her bad plastic surgery.

Sources connected with the production of "Botched" tell TMZ ... Dr. Terry Dubrow was clear that there were no drugs in Chyna's system that would have interfered with or prevented the surgery. There were several dozen people involved in the shooting, and they say she was lucid and clear.

Chyna appeared to correct a previous breast surgery.

As for the show, we're told producers have decided not to air it, out of respect for the WWE legend.

TMZ broke the story ... Chyna died of a possible overdose. She was 46.