Email, Emily Miller, Ted Cruz campaign, Aug. 3, 2018
The ad says "Beto O'Rourke said we should consider legalizing all narcotics, including heroin." This statement is objectively correct.
O'Rourke introduced a resolution in the El Paso City Council explicitly "supporting an honest, open national debate on ending the prohibition on narcotics."
And, at a Jan. 6, 2009 city council meeting O'Rourke elaborated: "And also, looking at ending the prohibition on narcotics in the United States. And I’m not saying that we need to do that – to end the prohibition . . . . I think we need to have a serious discussion about doing that, and that may, in the end, be the right course of action.”
Under any reasonable understanding of the English language, that constitutes him saying "we should consider legalizing all narcotics."