The "Domestic Partnership Equality Amendment Act of 2006" was a major expansion of the benefits of domestic partners. The law came into effect on April 4, 2006. This act provides that in almost all cases a domestic partner will have the same rights as a spouse regarding inheritance, probate, guardianship, and certain other rights traditionally accorded to spouses. The act also gave the right to form premarital agreements for prospective partners, and for domestic partners to not testify against their partner in court. However, it does not extend most benefits of legal marriage to domestic partners, such as the marital estate tax deduction. At the time of this latest expansion coming into effect in April 2006, there were 587 registered couples.