The Marijuana Herald’s Essential Marijuana Guides bring together our most useful resources on marijuana laws, cannabinoids, terpenes, consumption, testing and other key topics. Browse the guides below for detailed, regularly updated information based on government sources, scientific research and original reporting.
Marijuana Laws by State
A complete state-by-state guide to recreational and medical marijuana laws, including possession, home cultivation, legal sales, penalties and hemp-derived THC rules.
Cannabinoids Explained
A detailed guide to THC, CBD, CBG, CBN, CBC, THCV and other cannabinoids, including how they work and what current research actually shows.
Cannabis Terpenes Explained
Explore myrcene, limonene, pinene, caryophyllene, linalool and other marijuana terpenes, including their aromas, potential effects and scientific evidence.
Marijuana DUI Laws by State
A state-by-state breakdown of marijuana-impaired driving laws, including THC limits, zero-tolerance rules and impairment-based standards.
Marijuana Employment Laws by State
Compare marijuana workplace protections across the country, including employee drug testing, off-duty use, medical marijuana protections and major exceptions.
Marijuana Expungement Laws by State
Learn which states allow marijuana convictions and arrests to be expunged, sealed, vacated or otherwise cleared from a person’s record.
How Marijuana Edibles Work
A comprehensive guide to edible THC dosage, onset, duration, 11-hydroxy-THC and why eating marijuana can feel so different from smoking or vaping it.
How to Read a Marijuana Lab Report
Learn how to understand a marijuana Certificate of Analysis (COA), including THC and THCA, total THC calculations, terpenes, contaminants, pesticides, heavy metals and testing terminology.
The History of Cannabis Legalization in the United States
Follow the evolution of U.S. marijuana policy from early reform efforts and medical legalization through the rise of recreational legalization and the modern legal landscape.
