How the AP-NORC poll on drugs was conducted

The Associated Press-NORC Center for Public Affairs Research poll on drugs and substance abuse was conducted by NORC Feb. 11-14. It is based on online and telephone interviews of 1,042 adults who are members of NORC's nationally representative AmeriSpeak panel. The original sample was drawn from respondents selected randomly from NORC's National Frame based on address-based sampling and recruited by mail, email, telephone and face-to-face interviews. NORC interviews participants over the phone if they don't have Internet access. With a probability basis and coverage of people who can't access the Internet, surveys using AmeriSpeak are nationally representative.