[2] Carroll was appointed to fill a council vacancy in May 2019, and in November 2020 he won a 4-year term as Councilmember, receiving the second highest number of votes in the City’s history.

His book, entitled Lab 257: The Disturbing Story of the Government's Secret Plum Island Germ Laboratory, was published by William Morrow on February 17, 2004, and highlighted connections between Plum Island and outbreaks of Lyme disease, the West Nile virus, duck viral enteritis, African swine fever virus, and Rift Valley fever, as well as the history of mismanagement at the Disease Center.

[9] Similar to events held by federal, state, and county elected officials, the mailers promoted neighborhood town hall meetings attended by residents and featured Carroll's name.

[10] On May 14, 2024, four First Amendment auditors attended an open town hall hosted by Councilmember Carroll which was intended to "discuss upcoming planning commission decisions," in which they verbally confronted many attendees.

Irvine Watchdog contributor Tiffany Im criticized Carroll's conduct during the town hall meeting itself, including his alleged dismissal of public inquiries and failure to address the hostile behavior of attendees.