Citation(s) from the GunPolicy.org literature library
Parker, Sarah. 2011 ‘Balancing Act: Regulation of Civilian Firearm Possession.’ Small Arms Survey 2011: States of Security; Chapter 9, p. 277. Cambridge: Cambridge University Press. 6 July
Drug Dependency and Intoxication
In some countries, licences or the purchase of a firearm will be refused if the applicant has a history of alcohol or substance abuse or drug or chemical dependency (as in Croatia, South Africa, Turkey, the United States, and Yemen*). In other countries, the fact that a person has a history of drug dependency or is an alcoholic is taken into consideration when determining whether he or she is 'fit and proper' to own a firearm, as in the Dominican Republic, New Zealand, and the United Kingdom… In Kazakhstan, an applicant must certify that he or she is neither an alcoholic nor a drug addict…
In Estonia, a firearm licence (weapons permit) can be suspended for a year if the licensee is caught operating a car (or train or plane) under the influence of drugs or alcohol, even without being in possession of a firearm at the time.
*In Yemen, such a refusal would relate only to a licence to carry. Yemen does not place any restrictions on buying a weapon; there are restrictions on obtaining a licence to carry a weapon, however.