The Japanese criminal justice system is not up to first world standards.
"The litany of violations that commonly take place while the detainee is in daiyou kangoku would befit places such as China, Turkey, or the Israeli occupied West Bank. Detainees are subject to extremely long (e.g. over twelve hours) questioning sessions, designed to wear them down. Sleep deprivation is common, as is the deprivation of adequate food, and suspects are often made to stand in uncomfortable positions for hours on end. Intimidation is the order of the day, with techniques such as repeated screaming in the detainee’s ears, and, though rarer, beatings have also been known to take place."
"The litany of violations that commonly take place while the detainee is in daiyou kangoku would befit places such as China, Turkey, or the Israeli occupied West Bank. Detainees are subject to extremely long (e.g. over twelve hours) questioning sessions, designed to wear them down. Sleep deprivation is common, as is the deprivation of adequate food, and suspects are often made to stand in uncomfortable positions for hours on end. Intimidation is the order of the day, with techniques such as repeated screaming in the detainee’s ears, and, though rarer, beatings have also been known to take place."
https://www.counterpunch.org/2014/06/02/japans-authoritarian...