* The Great Drug War: A Policy of Failure (1987): This book offers a comprehensive critique of the war on drugs, arguing that it is ineffective and harmful.
* The Prohibition of Marijuana: A Historical and Legal Overview (1972): This book traces the history of marijuana prohibition in the United States and analyzes its legal and social consequences.
* The Devil's Lettuce: The History of Marijuana in America (1987): This book provides a historical overview of marijuana use and its cultural significance in America.
* Marijuana: The New Prohibition (1981): This book examines the contemporary drug policy debate and argues for a more rational and humane approach to drug use.
* The Legalization of Marijuana: A Rational Approach to Drug Policy (1975): This book provides a detailed analysis of the arguments for and against marijuana legalization.
In addition to these books, Trebach has published numerous articles and essays on drug policy, as well as edited several books on the topic. His work has been influential in shaping the debate on drug policy and has helped to advance the cause of marijuana legalization.