Studies report consistently that cocaine and alcohol is currently the most upcoming drug combination in Europe. The Alcohol and Cocaine Impaired Drivers (ACID)-survey was conducted among Dutch partygoers (18-30 years old) to establish who will drive a car after using alcohol and/or cocaine and why. The purpose of this paper is to describe the methodology and design of the ACID-survey. The online survey comprised a large number of questions on demographics and respondent characteristics, alcohol and drug use, reasons for driving after using cocaine, and prevention methods. A total of 64,575 subjects read the invitation and 10,153 started the survey (15.7%). N=7,834 subjects completed the survey and met all criteria to be included in the analyses. The ACID-survey has provided a valid and reliable data set, representative for Dutch partygoers. The employed methodology showed to be a cost efficient way to monitor substance use and other risk behaviors in a high risk group of young adults.
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