The word “dope” prior to 2000, was synonymous to drugs;  it was some type of pharmaceutical, a concoction,  in some cases, snake oil;  something unacceptable;  it could harm you or it was not good for you for sure.  While there is no specific date that the word changed meaning in some settings, ………….it now means “cool”, in agreement, good for you, acceptable.  Some car manufacturers have incorporated it into their TV advertising.  The change in the meaning of the word  is international and very popular with young people in  Japan and other countries.  It pays to be aware of the context and content of the sentence with regard to the intended meaning of  “dope”.