Changing language means that the word "dope" when referring to drugs has moved on from marijuana, usually to heroin where it has effectively reversed into that use from the term "doped up," meaning in a highly drugged state. But it's also mutated from the equivalent of "it's the dope" meaning "it's the best" to "it's dope" meaning, approximately, very good. But all of these uses are relatively new: originally "a dope" was a stupid person. So, now you understand the headline, read the article which refers to a disturbing form of spam.