Over the past three decades, the United States has experienced a significant increase in the use of security measures in public and private secondary schools. Measures including police officers, metal detectors, and security cameras are becoming more common in the hallways of American schools. Following this surge, a number of academics have become interested in understanding how these measures effect outcomes for students, yet little research has sought to explore the impact of security measures on parents. Using data from the Educational Longitudinal Study (2002), the current project explores the relationship between formal and informal parenting involvement with the school and the presence of school security measures utilizing Hierarchical Linear Modeling (HLM) regression. Results indicate the presence of a security guard and metal detectors is related to lower levels of formal parental involvement, all else equal. Security measures were not found to effect informal parental involvement occurring outside of the school proper.