While you could still be prosecuted in Austria, there's at least one institution in Vienna which tests (recreational) drugs for users and is accepted by the loc

While you could still be prosecuted in Austria, there's at least one institution in Vienna which tests (recreational) drugs for users and is accepted by the local police for their harm-reduction. The catch is that they can't return your (mostly quite small) samples after testing for legal reasons. http://www.checkyourdrugs.at/ http://www.checkyourdrugs.at/ if you read german.