According to your authors, the juvenile justice system has changed dramatically in recent decades. currently, the juvenile justice system is in what period of development

The appropriate response is "The Crime Control Period" 
The Crime Control Period is the below: 
- media and government officials underscore the peril of wrongdoing, including adolescent wrongdoing, prompting open requests for a crackdown 
- harsher disciplines for adolescents who perpetrate violations 
- waivers: juvi court postpones its ward, exchanging an adolescent case to the grown-up criminal court 
- Schall v. Martin 1984 - adolescents can be held in preventive confinement if there is worry that they may carry out extra violations while anticipating court activity

The dangers of an inadequate monetary supply.