Depends on where you are located in the country. I'm in a small town in West Texas and have been a probation officer for 5 years now and only earning 34K per year. I work for the County. Federal Probation Officers make much more.

What are you trying to ask?

The question here cannot be altered as there is a notation regarding doing so. Based on that, the answer for prisoners in the United States, is that the huge majority of probation programs are administered on the State level. Eligibility for probation is either based specifically on law or at the discretion of the sentencing judge in the case of criminal offenses.

2 years

Intermediate probation, intensive probabtion, strict probation, and "file drawer" probation.