Are you for real dude ? I ' m not going to reply again so if this doesn ' t get to you then that ' s fine . This took all of 2 seconds to type into Google and get a very rough idea The National Center for Missing Exploited Children NCMEC reports The total in the most recent survey was 747 , 408 That ' s almost a million todate right there , where most of them would still be in prison right now minus whoever died . How many prisoners can we hold ? According to the US Bureau of Justice Statistics BJS , 2 , 220 , 300 adults were incarcerated in US federal and state prisons , and county jails in 2013 In total , 6 , 899 , 000 adults were under correctional supervision probation , parole , jail , or prison in 2013 So todate , almost half of all prison cells would be occupied by a sex offender serving life . That already leaves not enough room for the remaining violent offenders , much less all of the drug offenders , so it wouldn ' t even work . Not to mention people out on parole need to have a bed on standby at the prison in case they violate parole . tldr your brain sucks .