1. have a documented pattern of substance abuse in the 12 months prior to arrest for which he/she is serving his/her current sentence;
2. be able to complete all three phases of RDAP, including community transition drug abuse treatment; and
3. be diagnosed by the Drug Abuse Program Psychologist as having a drug use disorder as defined by the American Psychiatric Association's Diagnostic and Statistical Manual (DSM).
You should contact your counselor to ask how to request that you be allowed to participate in the program. If you qualify and you have no detainers and you are not convicted of a violent crime this program can help you to get early release.
Even without this program you can earn good time credits of up to 54 days per year in federal jail (when the sentence is more than one year, as it is in your case), so you will still only have to do about 85% of the 30 months.