He believes that the most important drug policy challenge faced by the United States involves reversing the trend of increased drug use by young people and that drug legalization initiatives in California and Arizona make youth drug use more likely. He further indicates that drug control policies must be based on science rather than ideology and that the Federal Government is not opposed to the medical use of any drug if it passes scientific scrutiny. Specific aspects of the ONDCP's position on the passage of California Proposition 215 and Arizona Proposition 200 are detailed with respect to drug law enforcement, the integrity of the medical-scientific process by which substances are approved as safe and effective medicines, Federal drug-free workplace and safety programs, and the protection of children from increased marijuana availability and use.