According to the Federal Bureau of Investigation, there were an estimated 1,552,432 arrests across the United States for drug-related crimes in 2012. The number of arrests were slightly higher than the 1,531,251 arrests in 2011.
Arrests involving marijuana accounted for 48.3 percent of all drug arrests in the United States in 2012. According to the FBI data, there was one marijuana possession arrest every 48 seconds during 2012. If distribution charges are included, there was one marijuana arrest every 42 seconds.
Source: Steve Nelson, “Police Made One Marijuana Arrest Every 42 Seconds in 2012,” US News and World Report, September 16, 2013.