49d85a5b_North_Carolina_Crash_Data__Response
[Suggestion] Define the terms. Does alcohol involvement also include drugs? What if a person were using drugs, but not alcohol and got involved in an accident. Would that be counted under alcohol involvement? [Response] 
Variables are documented in the help section. Run a two-way table, counting vehicles and using the variables 'Alcohol-Involved Vehicle Flag' and 'Driver Alcohol/Drugs Suspected' to see the relationship between these two variables. Absent alcohol, drug involvement is not counted as alcohol involvement.
North Carolina Crash Data
Response