(a) This section applies to rollovers and transfers as specified in this section made on or after January 1, 2002. Notwithstanding any provision of this article to the contrary that would otherwise prohibit or limit rollovers and plan transfers to this system, the retirement system shall accept the following rollovers and plan transfers on behalf of a member solely for the purpose of purchasing permissive service credit, in whole or in part, as otherwise provided in this article or for the repayment of withdrawn or refunded contributions, in whole and in part, with respect to a previous forfeiture of service credit as otherwise provided in this article: (i) One or more rollovers within the meaning of Section 408(d)(3) of the Internal Revenue Code from an individual retirement account described in Section 408(a) of the Internal Revenue Code or from an individual retirement annuity described in Section 408(b) of the Internal Revenue Code; (ii) one or more rollovers described in Section 402(c) of the Internal Revenue Code from a retirement plan that is qualified under Section 401(a) of the Internal Revenue Code or from a plan described in Section 403(b) of the Internal Revenue Code; (iii) one or more rollovers described in Section 457(e)(16) of the Internal Revenue Code from a governmental plan described in Section 457 of the Internal Revenue Code; or (iv) direct trustee-to-trustee transfers or rollovers from a plan that is qualified under Section 401(a) of the Internal Revenue Code, from a plan described in Section 403(b) of the Internal Revenue Code or from a governmental plan described in Section 457 of the Internal Revenue Code: Provided, That any rollovers or transfers pursuant to this section shall be accepted by the system only if made in cash or other asset permitted by the board and only in accordance with such policies, practices and procedures established by the board from time to time. For purposes of this article, the following definitions and limitations apply:
(1) "Permissive service credit" means service credit which is permitted to be purchased under the terms of the retirement system by voluntary contributions in an amount which does not exceed the amount necessary to fund the benefit attributable to the period of service for which the service credit is being purchased, all as defined in Section 415(n)(3)(A) of the Internal Revenue Code: Provided, That no more than five years of "nonqualified service credit", as defined in Section 415(n)(3)(C) of the Internal Revenue Code, may be included in the permissive service credit allowed to be purchased (other than by means of a rollover or plan transfer), and no nonqualified service credit may be included in any such purchase (other than by means of a rollover or plan transfer) before the member has at least five years of participation in the retirement system.