RDAP is the only way to reduce a federal sentence. If she has not filed her paperwork beforehand to prepare for the qualifications of this program it is doubtful she can get in. The reduction for RDAP inmates is 12 months; 9 months for sentences of 24 months or less.  Federal inmates have to do 85% of their sentence which is 15.3 months in your sister's case.  

If he had time added to his sentence from another charge and one year was tacked on, they will make him service 85% of that year unless there is something else about the sentence we do not know.

Sometimes the movement of an inmate is not a bad thing. As inmates get "closer to the door", their custody level can change and if there are re-entry programs awaiting release. Stay positive and hope for the best.

The rules in state prison are 85% of the sentence must be served, unless there is a parole provision in the Judgement and Commitment papers. There is a 15% good time reduction that is granted at the beginning of the sentence - the inmate can only lose that over time, not get more good time.

All sentences (except for "life") come with "good time credits". Usually this is 15% of the length of the sentence. You can only lose these good time credits for breaking the rules while incarcerated.  There is a parole system for most state prisons but the only inmates eligible must have it designated on the Judgement and Commitment document.  Federal prison does not have parole but they do have RDAP. RDAP is the Residential Drug Abuse Program. Inmates that are eligible

There is no sentence reduction law signed into action recently or in the past. This is a typical prison rumor that goes on all over the country, not just Arizona.  There is a bill being pushed by Sen. Steve Pierce, R-Prescott which is in direct deference to Gov. Doug Ducey's executive budget calling for $40 million for a new prison with 3,000 beds.  The senator's bill would release thousands of non-violent inmates early in a bid to save money and ease pressure

Some websites have the sentencing information. For the MCI facilities, use this link and enter your inmate's name: http://www.mass.gov/eopss/agencies/doc/locate-an-offender.html.   Another avenue is to call the Clerk of the Court where he was charged. You can actually talk to the judge's secretary and get all of the court documents (might have to pay for the printing) regarding the case.

When someone takes a plea deal, the reduction is included in the sentence for "taking responsibility".  Unless he has some information that will help the authorities solve another crime, he is likely to do 85% of the sentence. You might ask to see the Judgement and Commitment document from the judge's office, if there is a parole provision (state only) then there is some possibility for reduced time if the parole board elects to approve him for supervised release.

If they have substantial information that can lead to the arrest and conviction of another person, they will get a reduction. If they save the life of a prison worker, they will get a reduction. If they get a sentence commutation from the governor or president; and if they are in federal prison and can take the RDAP program, they will get a year off plus up to another year of guaranteed halfway house.

Inmates receive good time at the beginning of the sentence. As the time is served, the inmate can only lose the good time they are given by receiving incidence reports. Normally, good time is 15% of the sentence.