The school-to-prison pipeline is a phenomenon that is occurring in public schools across the country. This study investigates if the presence of a School Resource Officers (SRO) has an effect on the rate of expulsions experienced in schools. My data is from a secondary data set from the 2009-2010 School Survey on Crime and Safety. I use the presence of an SRO or security personnel, percentage of white student enrollment, school urbanicity, and percentage of students that score below the 15th percentile on standardized tests as independent variables. My dependent variable is expulsion rates for disobedient behavior. I create one model using OLS regression to run the dependent variable against all of the independent variables. The results yielded that the presence of security personnel or an SRO has increased the rate of expulsions due to disciplinary infractions. I also found that race decreased the expulsion rate; this means that as the percentage of white students goes up, the expulsion rate goes down. These findings suggests that the disproportionate amount of African Americans in this country’s prison system could be starting in our school systems.