Jesus, calm down mate
Yury only commented on what she said - it's possible she is just saying that to make herself feel better. He specified that he did not know whether Rebecca had taken drugs, however there were drugs at the party - hence, she was under the influence of alcohol, and possibly, drugs
Yury and kitek have an additional insight which we should value because otherwise we continue to argue over stupid things like this, when they are able to confirm exactly what is said. Our interpretations of what is said may each be different