(b) For all cases referred to the child support enforcement unit or applying for child support services under section 347.17 of this Part in which the location of the noncustodial parent, alleged parent or intended parent, or the income, assets, or medical support information of such person is unknown or unverified, the child support enforcement unit must:

1. (1) Use appropriate location sources such as the Federal Parent Locator Service (PLS) and State PLS; interstate location networks, local officials and employees administering public assistance, general assistance, medical assistance, Supplemental Nutrition Assistance Program, and social services; records of State agencies and departments, as authorized by State Law, including those departments which maintain records of public assistance, wages and employment, unemployment insurance, income taxation, driver licenses and vehicle registration, and criminal records; relatives and friends of the noncustodial parent, alleged parent or intended parent; current or past employers; utilities, electronic communications and internet service providers, and the U.S. Postal Service; financial references; unions and fraternal organizations; and police, corrections, parole, and probation records, if appropriate; and other sources.
2. (2) Establish working relationships with all appropriate agencies in order to utilize location resources effectively.
3. (3) Employ methodologies that safeguard all confidential information and data pertaining to the noncustodial parent, alleged parent or intended parent, obtained through location sources as provided in section 111-v of the Social Services Law.
4. (4) Within no more than 75 calendar days of determining that location efforts are necessary, access all appropriate location sources including transmitting appropriate cases to the State and the Federal PLS where there is sufficient information to initiate automated location efforts, ensure that location information is sufficient to take the next appropriate action in a case, and update automated case records as appropriate. Information critical to location activities includes the name, social security number, last known address(es) and employer(s) of the noncustodial parent, alleged parent and intended parent, and the date of birth of their children.
5. (5) Refer appropriate cases to the IV-D agency of any other state. The IV-D agency of the other state shall follow the procedures as described in paragraphs (1), (2), (3) and (4) of this subdivision; except that the responding state is not required to access the Federal PLS under paragraph (4) of this subdivision.
6. (6) Repeat location attempts in cases in which previous attempts to locate the noncustodial parent, alleged parent or intended parent, or sources of income and/or assets have failed but adequate identifying and other information exists to warrant submittal for location either immediately upon receipt of new information, or quarterly, whichever occurs sooner. Repeated attempts based on new information must meet the requirements of paragraph (4) of this subdivision. Quarterly attempts may be limited to automated sources but must include accessing State employment security files, including new hire reporting, wage reporting, and unemployment insurance benefits.
7. (7) Make a diligent effort to serve process on the noncustodial parent, alleged parent or intended parent, in cases in which previous attempts have failed but new information adequate to serve such process exists. Diligent effort to serve process on a noncustodial parent, alleged parent or intended parent means an attempt to serve process as soon as adequate information with respect to the location of such parent is obtained, but no later than 90 calendar days after receipt of such information.