SNAP Ban Study Act This bill directs the Government Accountability Office (GAO) to conduct a study to evaluate the effects of provisions that ban individuals who are convicted of drug felonies from participating in the Supplemental Nutrition Assistance Program (SNAP). Specifically, GAO must evaluate the effects of (1) the post-incarceration ban on participation by individuals convicted of a drug felony, and (2) state waiver provisions allowing for participation by these individuals. (The Personal Responsibility and Work Opportunity Reconciliation Act of 1996 bars convicted drug felons from participating in SNAP; however, a state may opt to serve such felons by waiving or modifying the requirement.) The GAO must submit a report to Congress on the study and make the report publicly available on the agency's website.