Final answer:
Mandatory sentencing is the type of sentencing plan that allows no leeway in the imposition of a sentence for a person convicted of a crime, prescribing specific and uniform mandatory sentences.
Step-by-step explanation:
The type of sentencing plan that allows no leeway in the imposition of a sentence for a person convicted of a crime is mandatory sentencing. Mandatory sentencing laws require judges to impose specific and uniform sentences without considering the individual circumstances of the case or the offender. Such laws often create minimum sentences for certain crimes and do not allow a judge to sentence below these minimums, regardless of mitigating factors. This contrasts with other sentencing methods, such as indeterminate sentencing, which allows for parole and judges to have discretion in sentencing; presumptive sentencing, which sets a standard range of sentences while still allowing some judicial discretion; and truth in sentencing, where the offender serves a substantial portion of the sentence and is not eligible for early release.