A Prison Releasee Reoffender (PRR) is defined under Florida Statute . Essentially it is a person who has been released from a correctional facility within the past 3 years and the current charge is an enumerated felony.
What this means is that is a defendant has been released from corrections, including parole or early release, or on escape status, and they are convicted of a new enumerated felony that law requires a day for day sentence, with no gain time or time off for good behavior.
So if a person is charged and convicted of, as an example, burglary of a residence, and the government is able to prove he is a PRR, the Judge has no discretion except to sentence him to 15 years day for day. This result is reached because the PRR statute requires the maximum sentence allowable must be imposed. In this case, a burglary of a dwelling is a 2nd degree felony, punishable by up to 15 years. Because the maximum penalty is 15 years the Court must sentence the person to 15 years, regardless of what the person's guidelines range might be. The court has no discretion in sentencing to anything less then the 15 years.
The numerated felonies that the PRR statute covers are:
a second degree felony, punishable by up to 15 years in prison,