It is entirely possible that this was real LSD. To believe that the "real" stuff can't cause these kinds of psychotic episodes is absolutely naive. It is also very unlikely DXM would ever be passed off as LSD, the dosage range is in the 200-800mg area and as such is IMPOSSIBLE to fit on any standard blotter. DXM is also a disassociative drug primarily effecting the NMDA receptor sites in the brain whose effects are markedly different from the sertonergic-centric tryptamine effect produced by LSD and related substances.