Youth voter turnout remains stubbornly low and unresponsive to civic education. Rigorous evaluations of the effects of adopting civics tests for high school graduation by some states on youth voter turnout remain limited. We estimate the impact of a recent, state-mandated civics test policy--the Civics Education Initiative (CEI)--on youth voter turnout by exploiting spatial and temporal variation in the adoption of CEI across states. Using nationally representative data from the 1996 to 2020 Current Population Survey and a difference-in-differences analysis, we find that CEI does not significantly affect youth voter turnout. Our null results, largely insensitive to a variety of alternative specifications and robustness checks, provide evidence regarding the lack of efficacy of civics test policies when it comes to youth voter participation.