Total Number of People On Probation For Drug Offenses In The US, 2015

Of the 3,789,800 adults on probation in the US at the end of 2015, 25% (approximately 947,450 people) had a drug charge as their most serious offense.

Source: 

Danielle Kaeble and Thomas P. Bonczar, "Probation and Parole in the United States, 2015" (Washington, DC: US Dept of Justice Bureau of Justice Statistics, Dec. 2016), NCJ250230, Table 1, p. 3, and Table 4, p. 5.
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