; 132 Stat. 348); (2) the best means of ensuring that a subscriber or provider has the ability to block calls from a caller using an unauthenticated number; (3) the impact on the privacy of a telephone subscriber from unauthenticated calls; (4) the effectiveness in verifying the accuracy of caller identification information; and (5) the availability and cost of providing protection from the unwanted calls or text messages described in subsection (a). 5. Interagency working group (a) In general The Attorney General of the United States, in consultation with the Chairman of the Federal Communications Commission, shall convene an interagency working group to study Government prosecution of violations of section 227(b) of the Communications Act of 1935 ( 47 U.S.C. 227(b) ). (b) Duties In carrying out the study under subsection (a), the interagency working group shall— (1) determine whether, and if so how, any Federal law, including regulations, policies, and practices, or budgetary or jurisdictional constraints inhibit the prosecution of such violations; (2) identify existing and potential Federal policies and programs that encourage and improve coordination among Federal departments and agencies and States, and between States, in the prevention and prosecution of such violations; (3) identify existing and potential international policies and programs that encourage and improve coordination between nations in the prevention and prosecution of such violations; and (4) consider— (A) the benefit and potential sources of additional resources for the Federal prevention and prosecution of criminal violations of that section; (B) whether to establish memoranda of understanding regarding the prevention and prosecution of such violations between— (i) the States; (ii) the States and the Federal Government; and (iii) the Federal Government and a foreign government; (C) whether to establish a process to allow States to request Federal subpoenas from the Federal Communications Commission