This dataset reports number of successful naloxone reversals by police officers, as self-reported by municipal police departments, Capitol Police, and Pennsylvania State police. The data is stratified by county and by year. Note that there is no legislation mandating that law enforcement report naloxone reversals to DDAP; these data represent voluntary self-reports from departments. NA - Not applicable. No FIPS code or county code exist for Pennsylvania State Police and Capitol Police. Also, counties labelled “NA” do not have municipal police departments and are only covered by Pennsylvania State Police.