Template:Number of marijuana prisoners in the USA

See Marijuana | Drug War Facts. Section called "Cannabis and the Criminal Justice System", and its subsection titled "State and Federal Marijuana Prisoners". It says there were around 44,000 in 2004. This does not include those in jails.

Life In Prison For Pot And Other Travesties Of Marijuana Prohibition. 4 Sept. 2014. Forbes. From the article (emphasis added):

Nearly One In Eight US Drug Prisoners Are Behind Bars For Pot -- Taxpayers Spending Over $1 Billion Annually To Incarcerate Pot Offenders. 12 October 2006. NORML. Total spending is much more than $1 billion dollars when cost of foster care, police, courts, lawyers, parole, probation, etc. included.