(a) Except as provided in subsection (b), an action pursuant to this Act may not be filed more than 3 years after the discovery of the facts constituting the grounds for commencing the action.
     (b) Notwithstanding subsection (a), an action may be filed pursuant to this Act within not more than 8 years after the commission of an act constituting a violation of this Act, Section 17-8.5 or Section 17-10.5 of the Criminal Code of 1961 or the Criminal Code of 2012, or a violation of Article 46 of the Criminal Code of 1961.