In custody doesn't even necessarily involve being charged.
"Q: How many men and women are in a Canadian prison on a given day?
A: In 2010/2011,on a given day 38,219 adults [1] and 16,279 youth (aged 12 to 17 years) [2] were in custody in Canada (federal and provincial), for a total of 54,498 inmates.
2,818 were in custody in British Columbia’s provincial correctional system. [1]
13,758 were in federal custody. [1]
In total, just over 24,461 adults were admitted to provincial or territorial jails in 2010/2011. [1]
However there were only 10,916 admissions into provincial or territorial custody to serve a sentence. The difference is accounted for by the number of people held in remand while awaiting their trial or sentencing.[3] "
"Q: How many men and women are in a Canadian prison on a given day? A: In 2010/2011,on a given day 38,219 adults [1] and 16,279 youth (aged 12 to 17 years) [2] were in custody in Canada (federal and provincial), for a total of 54,498 inmates.
2,818 were in custody in British Columbia’s provincial correctional system. [1] 13,758 were in federal custody. [1] In total, just over 24,461 adults were admitted to provincial or territorial jails in 2010/2011. [1]
However there were only 10,916 admissions into provincial or territorial custody to serve a sentence. The difference is accounted for by the number of people held in remand while awaiting their trial or sentencing.[3] "
http://ccphe.ubc.ca/resources/general-information-on-canadia...
That at least answers the question, even though it doesn't agree with what I read earlier.