John Walters and David Murray, writing for Hudson Institute:
If only marijuana use were legal, the argument goes, this threat to public well-being—wasted police resources, needlessly overcrowded prisons, and injustice against innocent marijuana users—would be avoided. Under this argument, the laws against marijuana use pose the greatest harm to society, greater than the impact of the drug itself. Do data actually support this position? In 2013, there were 11.3 million total arrests, 13.3 percent of which (totaling 1.5 million arrests) were for drug abuse violations.2 Most drug abuse violations were marijuana related offenses—marijuana possession arrests were 40.6 percent of all drug abuse violations and a little more than 5 percent of all annual arrests. These arrests are simply not a significant portion of law enforcement activity. Let’s focus on the drug possession offenses (though the conclusions would not be affected materially by incorporating drug trafficking offenses). Not only are possession arrests the largest category of drug violations, they represent the class of offenses most affected by legalization proposals.
Whole thing here.