Can I access the unimputed raw variables to explore non-responsiveness or missing data for particular questions?

No. In order to protect the privacy of our respondents this is not allowed. Moreover, using the original variables will not produce better quality research. NSDUH has developed sophisticated, scientifically sound procedures for data recoding and imputation. The imputed and/or recoded values are almost always more reliable for analysis than the raw data.

If you have a research project specifically focused on non-response, you can apply for access to restricted use NSDUH data through the interagency Standard Application Process (SAP) portal.