Mulligan serves on the California Internet Political Practices Commission that was created, as a result of the rapidly expanding role of the Internet in politics, to examine issues posed by political activity on the Internet in relation to the goals of the Political Reform Act of 1974 and recommend necessary legislative changes. In addition, she serves on the National Academy of Science Committee on Authentication Technologies and their Privacy Implications to assess emerging approaches to authentication in computing and communications systems, focusing on the implications of authentication technologies for privacy.

Mulligan wrote "Privacy in the Digital Age: Work in Progress," in Nova Law Review (with Berman, Winter 1999). With the Center for Democracy and Technology, she issued a report titled Square Pegs and Round Holes: Applying the Campaign Finance Law to the Internet--Risks to Free Expression and Democratic Values (October 1999). She also prepared the Report to the Federal Trade Commission of the Ad-Hoc Working Group on Unsolicited Commercial Email (July 1998).

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