Drunk drivers, drug dealers, petty thieves and killers make trouble for themselves and officers processing them in St Louis County Jail's open central booking area, before they're assigned to cells.
Behind the big electric fence at one Colorado prison, inmates have resorted to classic convict behaviour. Gangs and other illegal activities flourish here, posing serious problems for officers.
Just south of the US-Mexico border, notorious Mexican prison Cedes houses a number of criminals linked to dangerous and influential drug cartels.
Meet the officers trying to protect Cuyahoga County Jail from the spread of the Heartless Felons – one of Ohio's deadliest prison gangs.
Go inside one of America’s most dangerous prisons where hardened criminals may be female, but it's just as difficult to keep them in line.