(a)
Full registration period
A sex offender shall keep the registration current for the full registration period (excluding any time the sex offender is in custody or civilly committed) unless the offender is allowed a reduction under subsection (b). The full registration period is—
(1)
15 years, if the offender is a tier I sex offender;
(2)
25 years, if the offender is a tier II sex offender; and
(3)
the life of the offender, if the offender is a tier III sex offender.