wondering the new law to release signed by Trump... who does this effect and how do you know if your friend may qualify for this?

The First Step Act has retroactively released about 3,000 inmates last month that qualified for the reduction in their sentence. Inmates have an opportunity to get their sentence time reduced and participate in recidivism programs. To prepare for their release, the Justice Department worked with probation offices to create individualized release plans to ensure a smooth transition. These plans included drug treatment, post-release employment aid, and youth mentorship, among others. 
The Justice Department also announced sentence reductions through retroactive application of the 2010 Fair Sentencing Act, which the agency said reduces "the disparity between crack cocaine and powder cocaine threshold amounts triggering mandatory minimum sentences."