House Bill 4123 amends the Unified Code of Corrections to reduce truth-in-sentencing (TIS) restrictions as follows: (1) those convicted of first degree murder could earn sentence credits but would be required to serve 75%, rather than 100%, of their sentence, (2) removes the current restriction of 7.5 days per month for all Class X drug manufacture and delivery offenses, and (3) increases the number of allowed credits for several other offenses from 4.5 days per month to 8.5 days per month.