Any war on drugs history that involves cannabis starts in 1971, when President Nixon named drug abuse the nation's top enemy. Over the next five decades, enforcement grew, marijuana arrests climbed into the hundreds of thousands a year and the burden fell unevenly. State legalization, including Michigan's, has started to unwind that history, while federal law moves more slowly. Here's the short version.
War on drugs history: 1971 and "public enemy number one"
On June 17, 1971, President Nixon told reporters that "America's public enemy number one in the United States is drug abuse." He called for "a new, all-out offensive," asked Congress for $155 million in new funds and named a White House special consultant to coordinate the effort.
The groundwork was already in place. The Controlled Substances Act, signed in 1970, had put marijuana in Schedule I, the strictest federal category. Our guide to the Controlled Substances Act explains how that happened.
Enforcement ramps up: a new federal agency, the 1980s and mandatory minimums
In 1973, a federal reorganization created the Drug Enforcement Administration, combining earlier drug agencies into one. The 1980s raised the stakes. The Anti-Drug Abuse Act of 1986 built the basic framework of federal mandatory minimum sentences, tying prison time to the type and amount of drug involved.
Under federal law today, trafficking cases involving 100 kilograms or more of marijuana carry a minimum of five years in prison, and 1,000 kilograms or more carry at least ten.
Cannabis arrests by the numbers
| Period | Marijuana arrests | Reported by |
|---|---|---|
| 2001 to 2010 | More than 8 million in total | ACLU |
| 2018 | Almost 700,000, over 43% of all drug arrests | ACLU |
| 2024 | At least 204,036, about 92% for possession | FBI data compiled by NORML |
Recent counts are hard to compare with older ones because the FBI changed how it collects crime data in 2021, and some agencies don't report. Still, the totals have fallen as more states legalized.
Who bore the burden: racial disparities in enforcement
The ACLU found that in 2018 a Black person was 3.64 times more likely than a white person to be arrested for marijuana possession, up from 3.31 times in 2010. That held even though Black and white Americans use marijuana at similar rates. This gap sits at the center of our look at Black History Month and cannabis.
What it cost: dollars, records and families
In 2013, the ACLU estimated that enforcing marijuana laws cost about $3.6 billion a year. The costs didn't stop at budgets. A conviction can show up in background checks for jobs and housing for years, and jail time, fines and court dates pull parents away from work and family.
Those lasting effects are why equity programs and record-clearing are now part of legalization. Our explainer on cannabis social equity covers how states, Michigan included, approach it.
The turn: medical laws, state legalization and Michigan's 2018 vote
States began changing course in the 1990s with medical cannabis laws. Michigan voters approved medical marijuana in 2008 and adult-use legalization in 2018, and the adult-use law took effect on December 6, 2018. Today adults 21 and older can buy from licensed stores, and registered patients 18 and older can too. Our Michigan cannabis laws guide covers the limits.
Clearing old records in Michigan
Legal sales going forward don't erase old convictions on their own. Whether an old marijuana conviction qualifies depends on the offense and the rest of the record, so start with our guide to Michigan marijuana expungement, which covers the process and where to find free help.
Where federal policy stands now
As of October 2026, the federal fight over marijuana isn't finished. A final federal order effective April 28, 2026, moved marijuana covered by a state medical license, and marijuana drugs approved by the FDA, to Schedule III. All other marijuana, including adult-use, remains in Schedule I.
A broader proposal to move all marijuana to Schedule III went before a DEA administrative law judge this summer, and as of late October 2026 the recommended decision was still pending. Our rescheduling explainer tracks the latest. Until federal law changes, the old lines still matter, so don't travel across state lines with cannabis.
